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Trailer en Inglés

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The science is clear. The future is not.

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Leonardo DiCaprio is embarking on the role of a lifetime, exploring climate change's devastating impact on the planet and using his unprecedented access to speak with activists, scientists, and world leaders including Barack Obama, Elon Musk, and Pope Francis. Before The Flood premieres 30th October on National Geographic Channel and online.

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1. ¿Cómo cree que el derretimiento del polo ártico afectará a Colombia?

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1. ¿Cómo cree que el derretimiento del polo ártico afectará a Colombia?

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Vídeo

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5 things to know about the warming arctic

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5 Things to Know About the Warming Arctic

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National Geographic Explorer-in-Residence Enric Sala answers five questions regarding the critical state of Earth's sea ice, and what it means for us.

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2. ¿Cuál debe ser el plan de migración para la población vulnerable en Colombia?

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2. ¿Cuál debe ser el plan de migración para la población vulnerable en Colombia?

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Vídeo

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Leonardo DiCaprio visits Pacific island nations, Kiribati and Palau, to see first-hand the effects of climate change.

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3. Proporcione datos recientes sobre deforestación en Colombia y su impacto en el clima.

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3. Proporcione datos recientes sobre deforestación en Colombia y su impacto en el clima.

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Vídeo

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the consequences of deforestation in indonesia

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Leonardo DiCaprio learns about deforestation in Indonesia and its impact on climate change and native wildlife.

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6. Mencione las razones por las que apoyaría la expansión de las energías alternativas en Colombia?

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6. Mencione las razones por las que apoyaría la expansión de las energías alternativas en Colombia?

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Vídeo

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Leonardo DiCaprio visits China to learn about the country's shift from a reliance on fossil fuels to renewable energy.

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5. ¿Cuál es su posición frente al impuesto al carbono?¿Apoyaría a que se implementara en Colombia?

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5. ¿Cuál es su posición frente al impuesto al carbono?¿Apoyaría a que se implementara en Colombia?

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Artículo

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Advocates say it's the best way to address climate change, but the notion has a history of being politically dicey.

Burning fossil fuels is relatively cheap-until you factor in respiratory disease, floods, lower farm output, and many other effects from the resulting greenhouse gases.

That's why advocates say putting a price on how much carbon dioxide goes into the air is key to climate change action.

"It's hard to imagine reducing emissions enough to limit dangerous climate change without carbon pricing," says Helen Mountford, program director for the climate initiative New Climate Economy. She calls the idea a "vital piece of the puzzle."

Worldwide, making it most costly to pollute could help governments achieve the climate goals they agreed to pursue at landmark talks last year in Paris. Yet the words "carbon tax," or the related "cap and trade," can be politically charged.

U.S. President Barack Obama proposed in early 2016 a $10 per barrel fee on oil, which received blistering criticism from Republicans, who called it "dead on arrival" and a "horrible idea."

Still, the notion of putting a price on planet-warming carbon has gained traction over the past three decades, as this map from sustainability advocacy group Sightline Institute demonstrates. Currently, about 40 countries-including Sweden, Mexico, Japan, and Norway-and more than 20 localities have some kind of carbon pricing scheme, according to the World Bank.
Places Where it Already Works
In Denmark, which has had a carbon tax since 1992, emissions per person went down 15 percent between 1990 and 2005, according a report from the U.S. National Renewable Energy Lab, while Sweden's government estimates that its emissions by 2000 would have been higher by at least 20 percent had it not implemented a tax in 1991. Overall, Sweden's carbon emissions went down by a fifth between 1990 and 2012, while Denmark's fell almost 25 percent.

On the other hand, Norway actually saw emissions go up after its carbon tax was enacted in 1991, as its oil- and gas-driven economy grew. "Oil and gas production has been the main cause of the increase in Norway's carbon dioxide emissions," says the Norwegian Environment Agency, even as it calls the carbon tax its "main instrument in environmental policy."

And Australia, one of the biggest emitters per capita, repealed its carbon tax in 2014, citing a desire to "lower costs for Australian businesses and ease cost of living pressures for households."

But the concept has support in seemingly unlikely corners. In 2015, six European oil and gas companies called for governments to set a carbon price as part of international climate negotiations, saying it would provide a "clear roadmap for future investment."
How Do You Price Carbon?
What exactly should that price be? There's the tricky part: Existing prices around the world range from $2 to $168 per metric ton emitted.

Mountford says her group's research indicates that a price of $75 per ton in developed countries and $35 per ton elsewhere could cut emissions as much as 5.6 metric gigatons, or about a fifth of the way to bridging the emissions gap between where we are now and where we need to be to keep warming in check.

A carbon price can take shape in different ways. A tax like Obama's $10-per-oil-barrel proposal can provide certainty about costs for businesses; an emissions trading system, or cap-and-trade, on the other hand, sets a limit on the overall greenhouse gas amounts and lets polluters trade credits to stay under the ceiling. Either concept can be effective, says environmental research group World Resources Institute: "Critics focus on certain disadvantages of carbon taxes or cap-and-trade, but their arguments are unpersuasive if policies are well designed."

Opponents of a price on carbon argue that it will hike people's bills. Of course, the point is to make fossil fuels more expensive, and therefore less appealing, for everyone to use-it's the same strategy that has long been used with cigarettes and alcohol by a number of countries. So, it's an idea many of us can get behind in theory, but it sometimes sours when you're actually facing higher prices at the pump.

But there are ways to reduce the sting for consumers. One would be to return the money via tax cuts or rebates elsewhere. Under that scenario, a carbon price can gain favor. A report published in 2014 found that U.S. public support for a carbon price was only 38 percent if the money went toward reducing the federal deficit. But if it went toward a rebate check in the mail? Then 56 percent of people like the idea.
On Twitter: Follow Christina Nunez and get more environment and energy coverage at .

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What's a Carbon Tax, and How Does it Reduce Emissions?

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Advocates say it's the best way to address climate change, but the notion has a history of being politically dicey. Burning fossil fuels is relatively cheap-until you factor in respiratory disease, floods, lower farm output, and many other effects from the resulting greenhouse gases.

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7. ¿Cuántas Gigafábricas necesitaría Colombia para suministrar con electricidad el 100% de la población?

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7. ¿Cuántas Gigafábricas necesitaría Colombia para suministrar con electricidad el 100% de la población?

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Vídeo

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Leonardo DiCaprio visits Tesla's Gigafactory and discusses with Elon Musk how the world can transition from fossil fuels to renewable energy.

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8.¿Cuáles hábitos de los 14 presentados aplicaría en su vida diaria?¿Agregaría otras opciones?

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8.¿Cuáles hábitos de los 14 presentados aplicaría en su vida diaria?¿Agregaría otras opciones?

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Artículo

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We all have a role to play in the changing climate. Here are a few ways to lighten your impact.

Which countries are the world's biggest polluters? It depends. As a whole, China emits the most carbon dioxide in the world. Switch to the per-person view, and the picture changes: Countries including Australia, Canada, the United States, and Saudi Arabia rise to the top.

In the wake of last year's Paris Agreement, governments around the world are evaluating how to cut the planet-warming greenhouse gases that stoke climate change. But individuals can-and do-make everyday decisions to shrink their carbon footprints.

The first step is understanding how much carbon your household emits now. A few online tools can help you measure: The U.S. Environmental Protection Agency, for example, has a carbon footprint calculator that tells you how much CO2 you contribute each year based on activities such as home heating, driving, and recycling. In the United States, the average emissions per capita are about 17 metric tons (37,400 pounds) per year. Other groups, including University of California, Berkeley, the Global Footprint Network, and the World Wide Fund for Nature-UK have their own versions of calculators.

Numbers aside, the simple exercise of answering some questions about your lifestyle and energy use can help you think about where to cut back. Here are a few ideas to help you get started.

At Home

Replace old appliances, such as refrigerators, washing machines, water heaters, and clothes dryers, with smarter models. In the U.S., the ENERGY STAR program certifies a range of products for energy efficiency.

Adjust your thermostat up in warm months and down in cold ones, especially when you're not home.

Use cold water for washing clothes, then line-dry them.

Recycle. The EPA estimates that recycling glass, aluminum, plastic, and paper could save 582 pounds of CO2 per year, equivalent to more than 600 miles of driving.

Consider getting solar panels for your home or buying renewable energy credits.

On the Road

Save on gas with an electric, hybrid, or super fuel-efficient car. (Check out this electric car calculator from the Union of Concerned Scientists, which helps you take into account the electricity source where you live.)

Maximize fuel efficiency, no matter what model you drive: Keep tires inflated, avoid speeding, keep your trunk free of excess weight-and above all, avoid driving when you can walk, bike, carpool, or take public transit.

Reduce your flight travel where you can, and remember that, unfortunately for your personal comfort, first- and business-class seats have a higher carbon footprint than economy ones. (You can find the most efficient airlines ranked here.)

Purists don't love the idea, but buying carbon offsets-essentially, paying into projects that help compensate for the carbon you plan to emit-is another option. The environmental group NRDC offers a guide.

At the Store

National Geographic Channels

View more tip cards to see how else you can reduce your carbon footprint >>.

Buy less meat, and opt for sustainable sources when it comes to what you do purchase. By one estimate, consuming a pound of beef gives off more carbon than burning a gallon of gasoline.

Bring your own bags and buy in bulk when possible to reduce packaging.

Reduce your consumption of bottled water and other packaged drinks. In general, driving up demand for plastic means doing the same for fossil fuels.Consider the global impact of acquiring more stuff. One study found thata big share of China's pollution was associated with goods manufactured for export to the U.S. and elsewhere.

You can find more ideas for reducing your energy use, and therefore your carbon footprint, here.
On Twitter: Follow Christina Nunez and get more environment and energy coverage at .

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14 Easy Ways to Reduce Your Own Carbon Footprint

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We all have a role to play in the changing climate. Here are a few ways to lighten your impact. Which countries are the world's biggest polluters? It depends. As a whole, China emits the most carbon dioxide in the world.

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Discurso completo de DiCaprio ante la ONU

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Discurso completo de DiCaprio ante la ONU

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Artículo & Vídeo

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View the full statement by Leonardo DiCaprio, United Nations Messenger of Peace, at the opening of the Signature Ceremony for the Paris Agreement.

Thank you, Mr. Secretary General, for the honor to address this body once more. And thanks to the distinguished climate leaders assembled here today who are ready to take action.

President Abraham Lincoln was also thinking of bold action 150 years ago when he said:

The dogmas of the quiet past are inadequate to the stormy present. As our case is new so we must think anew and act anew. We must disenthrall ourselves and then we shall save our country."

He was speaking before the US Congress to confront the defining issue of his time - slavery.

Everyone knew it had to end but no one had the political will to stop it. Remarkably, his words ring as true today when applied to the defining crisis of our time - Climate Change.

As a UN Messenger of Peace, I have been travelling all over the world for the last two years documenting how this crisis is changing the natural balance of our planet. I have seen cities like Beijing choked by industrial pollution. Ancient Boreal forests in Canada that have been clear cut and rainforests in Indonesia that have been incinerated. In India I met farmers whose crops have literally been washed away by historic flooding. In America I have witnessed unprecedented droughts in California and sea level rise flooding the streets of Miami. In Greenland and in the Arctic I was astonished to see that ancient glaciers are rapidly disappearing well ahead of scientific predictions. All that I have seen and learned on this journey has terrified me.

There is no doubt in the world's scientific community that this a direct result of human activity and that the effects of climate change will become astronomically worse in the future.

I do not need to throw statistics at you. You know them better than I do, and more importantly, you know what will happen if this scourge is left unchecked. You know that climate change is happening faster than even the most pessimistic of scientists warned us decades ago. It has become a runaway freight train bringing with it an impending disaster for all living things.

Now think about the shame that each of us will carry when our children and grandchildren look back and realize that we had the means of stopping this devastation, but simply lacked the political will to do so.

Yes, we have achieved the Paris Agreement. More countries have come together to sign this agreement today than for any other cause in the history of humankind - and that is a reason for hope - but unfortunately the evidence shows us that it will not be enough.

Our planet cannot be saved unless we leave fossil fuels in the ground where they belong. An upheaval and massive change is required, now. One that leads to a new collective consciousness. A new collective evolution of the human race, inspired and enabled by a sense of urgency from all of you.

We all know that reversing the course of climate change will not be easy, but the tools are in our hands - if we apply them before it is too late.

Renewable energy, clean fuels, and putting a price on carbon pollution are beginning to turn the tide. This transition is not only the right thing for our world, but it also makes clear economic sense, and is possible within our lifetime.

But it is now upon you to do what great leaders have always done: to lead, inspire, and empower as President Lincoln did in his time.

We can congratulate each other today, but it will mean nothing if you return to your countries and fail to push beyond the promises of this historic agreement. Now is the time for bold unprecedented action.

My friends, look at the delegates around you. It is time to ask each other - which side of history will you be on?

As a citizen of our planet who has witnessed so much on this journey I thank you for all you have done to lay the foundation of a solution to this crisis, but after 21 years of debates and conferences it is time to declare no more talk. No more excuses. No more ten-year studies. No more allowing the fossil fuel companies to manipulate and dictate the science and policies that effect our future. This is the only body that can do what is needed. You, sitting in this very hall.

The world is now watching. You will either be lauded by future generations, or vilified by them.

Lincoln's words still resonate to all of us here today:

"We will be remembered in spite of ourselves. The fiery trial through which we pass will light us down, in honor or dishonor, to the last generation... We shall nobly save, or meanly lose, the last best hope of earth."

That is our charge now - you are the last best hope of Earth. We ask you to protect it. Or we - and all living things we cherish - are history.

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View the full statement by Leonardo DiCaprio, United Nations Messenger of Peace, at the opening of the Signature Ceremony for the Paris Agreement. Thank you, Mr. Secretary General, for the honor to address this body once more. And thanks to the distinguished climate leaders assembled here today who are ready to take action.

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Escenas y Personajes de mayor importancia

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Escenas y Personajes de mayor importancia

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Artículo & Vídeos

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Features Review: 7 key scenes in Leonardo DiCaprio's climate film Before the Flood

Before the Flood, a new feature-length documentary presented and produced by Leonardo DiCaprio, is released in cinemas tomorrow.

The Oscar-winning actor and environmentalist has spent the past three years asking a wide variety of people around the world about climate change. His collection of interviews in the film - ranging from Barack Obama and the Pope through to Elon Musk and Piers Sellars - cover the science, impacts, vested interests, politics and possible solutions.

Carbon Brief was invited to the European premiere of Before the Flood last weekend. Before the screening in London began, DiCaprio took to the stage to introduce the film. He said:

"Before The Flood is the product of an incredible three-year journey that took place with my co-creator and director Fisher Stevens. We went to every corner of the globe to document the devastating impacts of climate change and questioned humanity's ability to reverse what maybe the most catastrophic problem mankind has ever faced. There was a lot to take on. All that we witnessed on this journey shows us that our world's climate is incredibly interconnected and that it is at urgent breaking point...I've been incredibly moved by so many climate change documentaries in the past, but I never felt that I saw one that articulated the science clearly to the public. I think people grasp it, but it seems something distant, far off, intangible and almost otherworldly. An individual doesn't feel like they can make an impact. The journey for me was to try and make a modern-day film about climate change. I've been studying this issue for the past 15 years, I've been watching it very closely. What's incredibly terrifying is that things are happening way ahead of the scientific projections, 15 or 20 years ago...We wanted to create a film that gave people a sense of urgency, that made them understand what particular things are going to solve this problem. We bring up the issue of a carbon tax, for example, which I haven't seen in a lot of documentaries. Basically, sway a capitalist economy to try to invest in renewables, to bring less money and subsidies out of oil companies. These are the things that are really going to make a massive difference. It's gone beyond, as we talk about in the film, simple, individual actions. We need to use our vote...We cannot afford to have political leaders out there that do not believe in modern science, or the scientific method, or empirical truths...We cannot afford to waste time having people in power that choose to believe in the 2% of the scientific community that is basically bought off by lobbyists and oil companies. They are living in the stone ages. They are living in the dark ages. We need to live in the future."

Here, Leo Hickman, Carbon Brief's editor, identifies seven key scenes in Before the Flood...

Setting the scene

In terms of box-office draw alone, Before the Flood is the most significant film about climate change since Al Gore's An Inconvenient Truth was released a decade ago. DiCaprio has made maximum use of his global star power to bring together some of the world's leading voices and experts on climate change and package them up into 90-minute narrative which drips with urgency, insights and emotion.

It opens with a surprisingly personal monologue by DiCaprio in which he talks about the "nightmarish" painting which hung over his crib as a child. "I would stare at it before I went to sleep," he explains, noting some of its themes - "over-population, debauchery, exodus". Hieronymus Bosch's Garden of Earthly Delights was painted more than 500 years ago, but it speaks to today, he says, with its "twisted, decayed, burnt landscape". DiCaprio says the triptych 's final panel shows a "paradise that's been degraded and destroyed". The film is named after the middle panel - Humankind before the Flood - which, he says, acts as an allegorical warning to the world of what could come next, if it fails to act on climate change.

DiCaprio then sets off around the world on his quest for answers: "I want to see exactly what is going on and how to solve it." But self-doubt looms large from the off, even after he is named by Ban Ki-moon as the UN messenger of peace on climate change.

"Try to talk to anyone about climate change and people just tune out. They might have picked the wrong guy." As DiCaprio says this, a montage plays of clips showing his media critics, such as Fox News' Sean Hannity, attacking him for his lack of scientific credentials and celebrity lifestyle.

However, DiCaprio is frank about how his fame has afforded him such a privileged perspective: "First time I heard of global warming was when I sat down one-to-one with Al Gore [in the early 2000s]. This is most important issue of our time, he said. I had no idea what he was talking about."

After viewing tar sands in Canada by helicopter - "kinda looks like Mordor " - and narwhal whales in Kangerlussuaq, Greenland, DiCaprio explains what, in his view, has changed in the time since he received Gore's climate lesson.

"Everyone was focused on small individual actions [back then]. Boiled down to simple solutions such as changing a light bulb. It's pretty clear that we are way beyond that now. Things have taken a massive turn for the worse."

1) Prof Jason Box

DiCaprio is helicoptered onto the Greenland ice sheet, where he meets with Jason Box, a professor at the Geological Survey of Denmark and Greenland (GEUS). Box has spent many Arctic summers monitoring the stability of the ice sheet, as well as, in more recent years, the way soot from forest fires and the burning of fossil fuels has darkened the snow and, hence, the ice's reflectivity, or albedo. As they both stare at a torrent of water rushing down into a moulin, Box's concern about the long-term melting trend is palpable:

"We keep finding things that aren't in the climate models. That tells me that the projections for the future are really conservative. If the climate stays at the temperature that it's been in in the last decade, Greenland is going away."

DiCaprio gently mocks Box's equipment for measuring the ice.

"This is a climate station? I was imagining a massive igloo with all kinds of scientists and experiments. It really does look like broken down pool equipment."

Then he questions why there is a long spiral of plastic hose laying on the ice. Box explains:

"The hose went down 30 feet, but [the ice] has now melted out. Five years of melt. Hundreds of cubic kilometres of ice stored on land that has now gone into the sea."

2) Prof Michael E Mann

No movie is complete without the bad guys. And DiCaprio is keen to stress the role that "corporate interests" have played in spreading "disinformation" about climate change.

A cast of villains is introduced ranging from right-wing newspapers and TV networks in the US through to politicians and "front groups". All seek to cast doubt on the science and, in doing so, attack climate scientists.

No scientist has been more in the crosshairs than Michael E Mann, the director of the Penn State Earth System Science Center who is best known for his famous hockey stick graph showing a recent spike in global temperatures.

Publishing that graph proved to be a huge turning point, Mann tells DiCaprio:

"I set myself up for a completely different life...I was vilified...I was called a fraud. I was being attacked by Congressmen. I had death threats, which were actionable enough that the FBI had to come to my office to look at an envelope that had white powder [in it]. I've had threats made against my family. These folks know they don't have to win a legitimate scientific debate. They just need to divide the public. All of that hatred and fear is organised and funded by just a few players. Fossil fuel interests...finance a very large echo chamber of climate change denialism. They find people with very impressive looking credentials who are willing to sell those credentials to fossil fuel interests. Front groups funded by corporate interests."

DiCaprio's frustration is clear: "If I were a scientist, I would be absolutely pissed every day of my life."

Footage from Frank Capra's 1958 short film for Bell Labs, The Unchained Goddess, which explains what impact burning fossil fuels will have on the climate, plays in the background.

"We've know about this problem for decades and decades," laments DiCaprio. "Imagine the world right now if we'd taken the science of climate change seriously back then. Since then our population has grown by five billion people and counting. The problem has become more difficult to solve."

3) Dr Sunita Narain

After a trip to Beijing to witness the smog and speak to experts about how releasing pollution data to citizens has helped to change public attitudes, DiCaprio arrives in India.

His meeting with Sunita Narain, director of the Centre for Science and Environment, provides, arguably, the key scene of the whole film. They discuss the sweetspot of the climate conundrum: how do developing nations with fast-rising populations raise standards of living for all without emitting vast volumes of greenhouse gases?

"We are a country where energy access is as much a challenge as climate change," says Narain. "We need to make sure that every Indian has access to energy."

DiCaprio mulls on that: "From what I understand, there are 300 million people without power in India. That's equivalent to the entire population of the United States."

As footage shows women in the village of Kheladi in Haryana burning uplas (cowdung cakes), Narain passionately lays out India's predicament:

SN: Coal is cheap, whether you or I like it or not. You have to think of it from this point of view. You created the problem in the past. We will create it in the future. We have 700m household using biomass to cook. If those households move to coal, there'll be that much more use of fossil fuels. Then the entire world is fried. If anyone tells you that the world's poor should move to solar and why do they have to make the mistakes we have made...I hear this from American NGOs all the time. I'm like, wow. I mean, if it was that easy, I would really have liked the US to move to solar. But you haven't. Let's put our money where our mouth is.

LD: We have to practice what we preach. Absolutely.

SN: I'm sorry to say this, and I know you're American, so please don't take this the wrong way, but your consumption is really going to put a hole in the planet. I think that's the conversation we need to have. I'll show you charts from this perspective. [Shows page from a book.] Electricity consumed by one American at home is equivalent to 1.5 citizens of France, 2.2 citizens of Japan and 10 citizens of China, 34 of India and 61 of Nigeria. Why? Because you're building bigger, you're building more and using much more than before. The fact is we need to put the issue of lifestyle and consumption at the centre of climate negotiations.

LD: Look, there's no way I don't agree with you. Absolutely correct. Yes, it's a very difficult argument to present to Americans that we need to change our lifestyle and I would probably argue that it's not going to happen. If we want to solve the climate crisis on, hopefully, that renewables like solar and wind will become cheaper and cheaper as more money is funnelled into them, and we invest into them, and, ultimately, we will solve that problem. But I... [Narain shakes her head.] You are shaking your head, obviously...

SN: I'm shaking my head Indian style, which means "no". Who will invest? Let's be real about this. Who will invest? And how will they invest? We are doing more investment into solar today. China is doing much more investment in solar today than the US is. What is the US doing which the rest of the world can learn from? You are a fossil-addicted country, but if you are seriously disengaging, that's something for us to learn from. And it's leadership that we can hold up to our government and say if the US is doing - and the US is doing it - then, despite all the pressures, then we can do it as well... But it's just not happening. People like us, we are rich enough to withstand the first hit of climate change. But it's the poor of India, it's the poor of Africa, the poor of Bangladesh, who are impacted today in what I believe are the first tides of climate change...We need countries to believe that climate change is real and it is urgent. It's not a figment of their imagination

The scene concludes with DiCaprio musing on his conversation with Narain:

"There's no doubt we have all benefitted from fossil fuels. I know I have. My footprint is probably a lot bigger than most people's. And there are times when I question what is the right thing to do. What actions should we be taking? There are over a billion people out there without electricity. They want lights. They want heat. They want the lifestyle that we've had in the United States for the last hundred years. If we are going to solve this problem, we all have a responsibility to set an example. And, more than that, help the developing world to transition before it's too late."

4) Prof Gidon Eshel

It is well known that DiCaprio has donated a significant proportion of his wealth and time to various habitat conservation projects, notably focused on oceans and tropical forests. So it isn't a surprise that he visits such locations in Before the Flood.

He views dead coral with marine biologist Jeremy Jackson. ("We're pushing this system really hard.") He flies over Sumatran forests being cleared by palm oil plantations with HAkA's Farwiza Farhan. ("I've never seen anything like this.") He feeds baby orangutans at a rescue centre in the Mount Leuser National Park with Dr Ian Singleton. ("They are refugees from the burning forest.")

The message is clear. Lifestyle choices are damaging these carbon-absorbing habitats. Boycott companies which use palm oil to make their products, urges DiCaprio. Switch from eating beef to chicken.

This particular suggestion is put forward by the next person DiCaprio visits. Gidon Eshel, a professor of environmental science and physics at Bard College in New York, was the lead author of a study published in 2014 in the Proceedings of the National Academy of Sciences. It made headlines around the world and found that beef is about 10 times more damaging to the environment than any other form of livestock. Eshel says:

"Of all the reasons for tropical deforestation, the foremost is beef. Beef is one of the most inefficient use of resources on the planet. In the US, 47% of land is used for food production and, of that, the lion's share is just to grow feed for cattle. The things that we actually eat - fruit, vegetables, nuts - it's a per cent. Most importantly, cows produce methane. And methane is a powerful greenhouse gas...About 10-12% of total US emissions is due to beef. It's staggering...Maybe not everyone is ready to eat tofu 24/7. I get that. But even if you just have to have some flesh between your teeth, if you switch to chicken, you will have eliminated 80% of what you emit, depending on where you are coming from."

5) Elon Musk

DiCaprio in now looking out across Los Angeles from a vantage point up in the Hollywood hills.

"Every single light that you see has to be completely different - has to come from a new power source. We need to build all those things differently. All the cars that are on the road need to be different. This is one city. If you zoom out to a map of the world at night, you see electrification all over the world. And we're fighting powerful fossil fuel interests who basically want to keep doing business as usual. How are we possibly going to turn all this around?"

Next he is in the Nevadan desert visiting the " gigafactory", the latest project of Tesla founder Elon Musk. Once at full operation by 2020, the vast factory aims to be producing annually 500,000 electric vehicles and batteries/cells equal to 85 GWh/yr. Musk explains why this could be a game-changer:

EM: What would it take to transition the whole world to sustainable energy? What kind of throughput would you actually need? You need a hundred gigafactories.

LD: A hundred of these?

EM: A hundred. Yes.

LD: That would make the United States...

EM: No, the whole world.

LD: The whole world?!

EM: The whole world.

LD: That's it?! That sounds manageable.

EM: If all the big companies do this then we can accelerate the transition and if governments can set the rules in favour of sustainable energy, then we can get there really quickly. But it's really fundamental: unless they put a price on carbon...

LD: ...then we are never going to be able to make the transition in time, right?

EM: Only way to do that is through a carbon tax.

[Carbon Brief has asked Tesla to explain how Musk arrived at this "100 gigafactory" claim. This article will be updated, if a reply is received.]

To drive this point home, DiCaprio then speaks to Gregory Mankiw, a Harvard economics professor, who has long argued for a carbon tax. ("Let me get this straight, you're a Republican who wants more taxes?") During a "call to action" segment at the end of the film before the credits roll, a link to Carbotax.org is shown.

6) Barack Obama

When you're Leonardo DiCaprio you can request a meeting with anyone on the planet. Which other filmmaker could include personal conversations with the US president, the Pope and the UN secretary general in one film?

However, given the imminent entry into force of the Paris Agreement on climate change, it is DiCaprio's exchange with Barack Obama at the White House which provides the most insight.

BO: [Paris] creates the architecture. I was happy with that. The targets set in Paris are nowhere near enough, compared to what the scientists tell us we need to solve this problem. But if we can use the next 20 years to apply existing technologies to reduce carbon emissions and then start slowly turning up the dials as new technologies come online, and we have more and more ambitious targets each year, then we're not going to completely reverse the warming that now is inevitable, but we could stop it before it becomes catastrophic...Even if someone came in [to the White House] denying climate science, reality has a way of hitting you on the nose if you're not paying attention and I think the public is starting to realise the science, in part because it is indisputable.

LD: You have access to information. What makes you terrified?

BO: A huge proportion of the world's population lives near oceans. If they start moving, then you start seeing scarce resources are subject to competition between populations. This is the reason the Pentagon has said this is a national security issue. And this is in addition to the sadness I would feel if my kids could never see a glacier the way that I did when I went up to Alaska. I want them to see the same things that I saw when I was growing up.

7) Dr Piers Sellers

There are very few people who can say they've had the privilege of being able to look down at the Earth from space. Piers Sellers, the British-born astronaut, spent a total of 35 days in orbit in the 1990s on three separate flights aboard the space shuttle. But back on Earth, he has spent much of his professional life modelling the climate system at NASA's Goddard Space Flight Center in Maryland. Earlier this year, he wrote in the New York Times about how being diagnosed with terminal cancer has sharpened his thinking on climate change.

Sitting in front of a huge screen showing NASA visualisations of the Earth's climate in motion, Sellers explains to DiCaprio how he views the current changes to the climate as a scientist.

PS: I realised that, as the science community, we have not done the best job, frankly, of communicating this threat to the public. When you go up there and see it with your own eye, you see how thin the world's atmosphere is. Tiny little onion skin around the Earth...[Sellers shows a visualisation.] Here's an example of one thing we can see - ocean surface temperature, as measured from space. You can see the poles melting.

LD: Wow.

PS: This is the way to do it, man. This is the way to really see what's going on. This is the Gulf Stream. Look at this. This is the motion of the ocean.

LD: This is like a great piece of art.

PS: It is, isn't it? The biggest impact will be here. [Sellers points.]

LD: In the Gulf Stream.

PS: This current... the dumping of ice off Greenland could stop this conveyor belt and the Gulf Stream would slow down and stop its transport of heat from here to there and then Europe would get cold toes because there is a lot of heat transport from across the tropics, across the north Atlantic that keeps Europe warm.

LD: Europe would get colder? A big misconception with climate change is that everything gets warmer.

PS: And here's the most advanced precipitation satellite in the world. It's very important, because we think the biggest impact from climate change is the moving of the precipitation belts from the equator to further out. We're already seeing more persistent drought...

LD: ...more drought in places that are already too hot?

PS: Yes. And there are a lot of papers written in the States and elsewhere about how that same drought has help to fuel conflict in the Syrian civil war, Darfur, Sudan, all these places that are short of water and short of food.

LD: Is just here or across the whole planet?

PS: We are expecting elsewhere. Bits of India. In the US, in Oklahoma, the Dust Bowl region, we expect that to be much, much drier over the next few decades.

LD: Oh my god. And what about my home state of California?

PS: Not looking great, I'm afraid. Our models predicted persistent drought in the Dust Bowl and here 50 years from now. But we're just seeing the worst drought in 900 years here right now, so it's coming a bit earlier than we thought. We're talking about this happening over the period of a few decades...

LD: This is not great news.

PS: People get confused about the issue, but the facts are crystal clear - the ice is melting, the Earth is warming, the sea level is rising - those are facts. Rather than being, "oh my god, this is helpless", say, "OK, this is the problem, let's be realistic and let's find a way out of it". And there are ways out of it. If we stopped burning fossil fuels right now, the planet would still keep warming for a little while before cooling off again.

LD: Would that Arctic ice start to then increase again?

PS: Once the cooling started, yeah.

LD: So there really is a possibility to repair this trajectory that we're on? Interesting.

PS: Yeah. There's hope...I'm basically an optimistic person. I really do have faith in people. And I think once people come out of the fog of confusion on this issue and the uncertainty on this issue and realistically appreciate it on some level as a threat, and are informed on some level on what the best action is to do to deal with it, they'll get on and do it and what seemed almost impossible to deal with becomes possible.

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Review: 7 key scenes in Leonardo DiCaprio's climate film Before the Flood

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Features Review: 7 key scenes in Leonardo DiCaprio's climate film Before the Flood Before the Flood, a new feature-length documentary presented and produced by Leonardo DiCaprio, is released in cinemas tomorrow. The Oscar-winning actor and environmentalist has spent the past three years asking a wide variety of people around the world about climate change.

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4. ¿Qué retos enfrenta Colombia para su autosuficiencia energética en las próximas décadas?

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4. ¿Qué retos enfrenta Colombia para su autosuficiencia energética en las próximas décadas?

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Vídeo

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Leonardo DiCaprio learns about India's reliance on coal to provide cheap electricity to its citizens, and why the adoption of solar in India is so important.