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https://docs.google.com/a/rchk.edu.hk/forms/d/1BnNKh_D5Y4DZVL4eIZurBLcNqe6hUrI0h6jdFFRhBq8/edit#responses

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What Does Overpopulation Mean Exactly? By Frosty Wooldridge 4-25-11

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https://www.youtube.com/watch?v=QsBT5EQt348

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How Facebook is Stealing Billions of Views

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Also why I never use facebook

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Evidence Facebook's revenue is based on fake likes. My first vid on the problem with Facebook: http://bit.ly/1dXudqY I know first-hand that Facebook's advertising model is deeply flawed. When I paid to promote my page I gained 80,000 followers in developing countries who didn't care about Veritasium (but I wasn't aware of this at the time).

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3 Reasons Why Nuclear Energy Is Terrible! 2/3

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What Really Happens To Your Body When You're Electrocuted?

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Over 100 people in the United States die each year from electrocution. What happens when electric charges surge through your body? Watch More: What Really Happens To Your Body When You Drown? ►►►► https://www.youtube.com/watch?v=CMxHQ5B7dZ8 Support Life Noggin on Patreon: https://www.patreon.com/LifeNogginStudios?ty=h Follow Us!

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The refugee crisis and why we sould help

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The refugee crisis and why we sould help

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Safe and Sorry – Terrorism & Mass Surveillance

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Is war ended?

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We live in the most peaceful time in human history. Wait, what? Seriously? That can't be right, there are more wars than ever! Well, no and they're killing fewer and fewer people, even though the world population is at an all-time high...and the numbers prove it!

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Is there a difference between real friends and Internet friends? How many friends do you actually need? Watch More: Does Your Dog Love You? ►►►► https://www.youtube.com/watch?v=8YoQm5X_NX0 Support Life Noggin on Patreon: https://www.patreon.com/LifeNogginStudios?ty=h Follow Us! https://twitter.com/LifeNoggin https://facebook.com/LifeNoggin Click here to see more videos: https://www.youtube.com/user/lifenoggin Life Noggin is a weekly animated educational series.

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5 "Impossible" Things That Can Happen On Other Planets

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Nowadays, bodies of water aren't necessarily something to build around-they're something to build on. They sport not just landfills and man-made beaches but also, in a nascent global trend, massive solar power plants.

Clean energy companies are turning to lakes, wetlands, ponds, and canals as building grounds for sunlight-slurping photovoltaic panels. So far, floating solar structures have been announced in, among other countries, the United Kingdom, Australia, India, and Italy.

The biggest floating plant, in terms of output, will soon be placed atop the reservoir of Japan's Yamakura Dam in Chiba prefecture, just east of Tokyo. When completed in March 2016, it will cover 180,000 square meters, hold 50,000 photovoltaic solar panels, and power nearly 5,000 households. It will also offset nearly 8,000 tons of carbon dioxide emissions annually. ( Since the EPA estimates a typical car releases 4.7 tons of CO2 annually, that's about 1,700 cars' worth of emissions.)

The Yamakura Dam project is a collaboration by Kyocera (a Kyoto-headquartered electronics manufacturer), Ciel et Terre (a French company that designs, finances, and operates photovoltaic installations), and Century Tokyo Leasing Corporation.

So, why build solar panels on water instead of just building them on land? Placing the panels on a lake or reservoir frees up surrounding land for agricultural use, conservation, or other development. With these benefits, though, come challenges. (See related story: " How Green Are Those Solar Panels, Really?")
Solar Enters New Territory
"Overall, this is a very interesting idea. If successful, it will bring a huge impact," says Yang Yang, a professor of engineering at the University of California, Los Angeles who specializes in photovoltaic solar panels. "However, I do have concerns of its safety against storms and other natural disasters, not to mention corrosion."

Unlike a solar installation on the ground or mounted on a rooftop, floating solar energy plants present relatively new difficulties. For one thing, everything needs to be waterproofed, including the panels and wiring. Plus, a giant, artificial contraption can't just be dropped into a local water supply without certain precautions, such as adherence to regulations on water quality-a relevant concern, particularly if the structure starts to weather away.

"That is one reason we chose Ciel et Terre's floating platforms, which are 100 percent recyclable and made of high-density polyethylene that can withstand ultraviolet rays and corrosion," says Ichiro Ikeda, general manager of Kyocera's solar energy marketing division.

Another obstacle? Japan's omnipresent threat of natural disasters. In addition to typhoons, the country is a global hot spot for earthquakes, landslides, and tidal waves.

To make sure the platforms could withstand the whims of Mother Nature, Ciel et Terre's research and development team brought in the big guns: a wind tunnel at Onera, the French aerospace lab. The company's patented Hydrelio system-those polyethylene "frames" that cradle the solar panels-was subjected to very high wind conditions that matched hurricane speeds. The system resisted winds of up to 118 miles per hour.
Why Japan Could Be the Perfect Spot
Given its weather, why build floating solar panels in the storm-filled, Ring of Fire-hugging Land of the Rising Sun? The reason: Many nations could benefit from floating solar power. And Japan is their poster child.

The largely mountainous archipelago of Japan suffers from a lack of usable land, meaning there's less room for anything to be built, let alone a large-scale solar plant. However, the nation is rich in reservoirs, since it has a sprawling rice industry to irrigate, so more solar energy companies in Japan are favoring liquid over land for construction sites. Suddenly, inaccessible terrain becomes accessible.

Kyocera's Ikeda says available land in Japan is especially hard to come by these days, as the number of ground-based solar plants in the country has skyrocketed in the past few years. (See related story: " Japan Solar Energy Soars, But Grid Needs to Catch Up.")

But, he added, "the country has many reservoirs for agricultural and flood-control purposes. There is great potential in carrying out solar power generation on these water surfaces."

In Japan's case, Ciel et Terre says that the region's frequent seismic fits aren't cause for concern, either. In fact, they illustrate another benefit that floating solar panels have over their terrestrial counterparts, the company says.

"Earthquakes have no impacts on the floating photovoltaic system, which has no foundation and an adequate anchoring system that ensures its stability," says Eva Pauly, international business manager at Ciel et Terre. "That's a big advantage in a country like Japan."
Solar's Potential Ecological Impact
Floating solar panel manufacturers hope their creations replace more controversial energy sources.

"Japan needs new, independent, renewable energy sources after the Fukushima disaster," says Pauly. "The country needs more independent sources of electricity after shutting down the nuclear power and relying heavily on imported liquid gas."

This up-and-coming aquatic alternative impacts organisms living in the water, though. The structure stymies sunlight penetration, slowly making the water cooler and darker. This can halt algae growth, for example, which Ciel et Terre project manager Lise Mesnager says "could be either positive or negative." If there's too much algae in the water, the shadow-casting floating panels might be beneficial; if the water harbors endangered species, they could harm them.

"It is really important for the operator to have a good idea of what kind of species can be found in the water body," Mesnager says.

Since companies must follow local environmental rules, these solar plants are usually in the center of the water, away from banks rich with flora and fauna. Plus, companies might prefer building in man-made reservoirs instead of natural ones, as the chances of harming the area's biodiversity are smaller.
Could the Future Include Salt Water?
More than three-quarters of our planet is ocean, which might present alternative energy companies a blank canvas on which to dot more buoyant energy farms. But moving floating panels to the open sea is still in the future. Kyocera's Ikeda says it would bring up a whole new realm of issues, from waves to changing water levels, which could lead to damage and disrupted operations.

Ciel et Terre is experimenting with salt water-friendly systems in Thailand, but ocean-based plants might be impractical, as offshore installations are costly, and it's more logical to produce electricity closer to where it'll be used.

For now, companies are aiming to build floating energy sources that conserve limited space, are cheaper than solar panels on terra firma, and are, above all, efficient. Ciel et Terre says that since its frames keep Kyocera's solar panels cool, the floating plant could generate up to 20 percent more energy than a typical ground system does.

The Yamakura Dam project might be the world's biggest floating solar plant, but it wasn't the first-and it almost certainly won't be the last.
The story is part of a special series that explores energy issues. For more, visit The Great Energy Challenge.

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Solar Panels Floating on Water Will Power Japan's Homes

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Nowadays, bodies of water aren't necessarily something to build around-they're something to build on. They sport not just landfills and man-made beaches but also, in a nascent global trend, massive solar power plants. Clean energy companies are turning to lakes, wetlands, ponds, and canals as building grounds for sunlight-slurping photovoltaic panels.

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Best conditions for generating solar energy

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The Eco Experts explain what factors affect where solar panels are placed and the best conditions for solar.

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The unpredictability of fossils fuels has spooked big players in the energy sector into exploring alternative, renewable and cheap sources of energy. The biggest investment is visibly slanting towards solar, wind and hydropower. While hydropower still rules the energy world, solar presents a clear choice for cheaper electricity moving into the future.

So, what is solar energy? It is energy derived from the sun. Renewable energy technologies such as solar cells and solar panels are used to harness the sun's energy to provide light, heat, hot water and generation of electricity for homes, businesses, and industries. Although solar energy has some flaws like inconsistency, inefficiency and high initial capital outlay, the upsides pretty much dwarf the downsides. The upsides to solar energy include low greenhouse emissions, beneficial to remote locations that are not connected to the main power grid, and provision of green jobs. It's also reliable in some areas and greatly reduces over dependence on fossils fuels.

Solar energy is an inexhaustible source of energy with the most potential as it will continue to produce solar power as long as the sun is there. Solar energy is totally free, widely available, produces no pollution, no emission and no noise which means generating solar power produces no carbon footprint. Among all the renewable energy sources available on Earth, solar energy is one of the most widely used renewable source of energy.

Solar energy has wide array of uses. It can be used to produce electricity, to run calculators, swimming pool heating, solar oven or solar cooker. Solar energy can now also be used to fly planes. This technology is however in its initial stage. In the year 2015, Solar Impulse , the first solar powered aircraft, started its Round-The-World flight from Abu Dhabi, on March 9. There is no doubt that solar energy is going to play a significant role in meeting demand supply gap for electricity.
Learn more about solar energy:

The use of solar energy has not been opened up because the oil industry does not own the sun.
- Ralph Nader

Disadvantages of Solar Energy

Although a lot of good stuff is said every day about solar energy, people should familiarize themselves with the disadvantages of solar energy before committing any financial resource. Here is an outline of basic disadvantages to solar energy:

This means that when the sun is not shining, there is no generation of energy. The generation of power is mostly affected at night and during winter months. Most people have now invested in battery backup systems, which store up power to be used when the sun is not shining. However, investing in backup systems can ramp up the overall cost of installing a solar panel. It mostly ends up not adding value to the solar energy technology.

Unlike other renewable energy sources which can also be operated during night, solar panels prove to be useless which means you have to depend on the local utility grid to draw power in the night or you can buy solar batteries to store excess power which you can later utilize in the night. Apart from that, storms or hurricanes also reduce your ability to draw power during those days.

Although installation of solar panels would bring immense benefits in the long run, the upfront costs can be punitive. Depending on the company you choose to buy solar panels from, it could cost an arm and leg. It's even difficult to quantify the entire cost of installation without the help of manufacturing companies. Some nations have introduced rebates and tax credits to enable lots of people to install solar panels, but unless you are putting some money aside for this, it can be an unbearable cost. Also, it might take up to 10 years to 15 years before you can break even with your initial investment. Its not about how much payback period is, anything that can reduce our dependence on fossil fuels is worth trying.

However, with most governments looking to get ahead of the severe global warming impacts, they have liaised with solar panel manufacturers to dial back on solar panel prices. Today, the average cost of a solar panel is $0.65 per watt. The same solar panels were selling at $0.74 per watt just a year ago. This is a significant commitment to get everyone on board in the use of solar energy.

A lot has been documented about the inefficiency of solar energy. Most people do not understand what efficiency means. People look at 15% efficiency and think that it's not good enough. They think that the ideal efficiency ought to be 100%. Efficiency is all about the amount of space it takes to generate the energy. It would shock you to know that a 250-watt solar panel featuring 15% efficiency produces the same power like a 250-watt solar panel featuring 20% efficiency. The disparity is shown in size. Smaller panels tend to be more efficient than larger panels.

Higher efficiency is vital when looking to power small electronics due to the space aspect. Nonetheless, a roof is adequate to generate power for any household use. This means people only invest in rooftop solar panels when the roof space is small. It's also good to note that more efficient panels are relatively expensive.

Solar energy technologies like solar panels present challenges when looking to move. The solar contracting company will switch the lease agreement to the new user if you decide to move out. These companies do not want to incur any further cost of taking the solar panels down. In fact, they have expert personnel that work in conjunction with realtors, title agents, and inspection agents to ensure smooth transition to the new tenant. In case you choose to take the solar panel with you, plus the lease contract, the company can expedite things, but you'll have to take care of the de-installation and re-installation cost.

Materials used to make solar panels can cause pollution

There is no up-to-date information on the possibility to recycle PV panels. Although solar panels have remarkable lifespan of about half a century, disposing of these materials can have severe impacts on the environment. This is a challenge that has been ignored over the years and must be addressed now.

The fact that the sun is unpredictable means solar energy cannot be relied upon to power a country's economy. Solar energy technologies are still being developed, and scientists predict that the technologies will be able to cater to a majority of world population by 2020. Until then, we will still rely on fossil fuels as the main energy source.

For home users, a solar energy installation may not require huge space as it can be installed on rooftops that can produce sufficient energy but for big companies, a large area is required for the system to be efficient in providing electricity on a constant basis.

Various Uses of Solar Energy

When you take into account the power resources and energy you throw into cooking only; the utility bill might send shock waves through your body. Utilizing solar energy to cook is simpler than you think. Imagine trading a conventional oven for a solar one? It sounds interesting, to say the least. Solar cookers use reflective solar box or a parabolic disc. This technology is more advantageous in developing nations as it takes away the burden of scavenging forests in search of firewood for cooking, reduces the burden of cooking for women and minimizes respiratory diseases associated with the emission of smoke from firewood. Solar dryers have also been invented to preserve vegetables and fruits in gardens.

Statistically, more than 90% of Israeli homes are installed with solar water heaters. In Canada alone, over 600, 000 m2 of solar water collectors have been set up. This underlines the importance of solar energy as a heating mechanism for your home. The sun's heat can be harnessed using flat plate or evacuated tubes. Just by committing less than $10, 000, this technology can provide 50 to 80% of your hot water needs.

Solar powered cars are gradually making inroads into the market. This represents the best possibilities for saving your out-of-pocket fuel costs. A typical example of solar power car is the Nissan Leaf EV.

Experts project that by 2050; almost every roof in homes will be covered by solar panels. If you reflect back 30 years ago, the cost of photovoltaics (PV) stood at $100 per watt. Today, an installed PV system costs $3.8 per watt. This shows that the 2050 dream will become a reality. Solar electricity has also provided an excellent backup to conventional electricity, which is prone to frequent interruptions.

Some people live in areas where water sources are unsafe. The sun can play a critical role here by filtering muddy water. Also, filling up plastic pop bottles and placing them out in the sun for about six hours disinfect the water. The sun's UV rays have the power to exterminate any organisms or bacteria in the water, hence, minimizing the causes of diarrhea in the area. For those residing near seas, you'll realize that desalinization plants are increasingly using solar energy to purify the water.

The need to use clean energy and to become self-sufficient will see an explosion of solar energy technologies in the future. The greatest beneficiaries will be people living in remote areas. Spread of solar energy technologies in these areas will mean more electricity, hence, rapid economic expansion, leading improved quality of life.

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Various Disadvantages of Solar Energy - Conserve Energy Future

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The unpredictability of fossils fuels has spooked big players in the energy sector into exploring alternative, renewable and cheap sources of energy. The biggest investment is visibly slanting towards solar, wind and hydropower. While hydropower still rules the energy world, solar presents a clear choice for cheaper electricity moving into the future.

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Clean Power
Originally published on Cost of Solar.
Everything has its advantages and disadvantages, its pluses and minuses. So, naturally, there must be a number of solar power advantages and solar power disadvantages too, right? It's been awhile since I ran down a list of solar power advantages and disadvantages, so I figured this topic was ripe for a refresher.

Solar Power Advantages

There are many solar power advantages worth noting. In no particular order (well, perhaps simply the order in which they come to mind), here are some of the top advantages:

Solar power helps to slow/stop global warming. Global warming threatens the survival of human society, as well as the survival of countless species. Luckily, decades (or even centuries) of research have led to efficient solar panel systems that create electricity without producing global warming pollution. Solar power is now very clearly one of the most important solutions to the global warming crisis.

Solar power saves society billions or trillions of dollars. Even long before society's very existence is threatened by global warming, within the coming decades, global warming is projected to cost society trillions of dollars if left unabated. So, even ignoring the very long-term threat of societal suicide, fighting global warming with solar power will likely save society billions or even trillions of dollars.

Solar power saves you money. Putting solar PV panels on your roof is likely to save you tens of thousands of dollars. The average 20-year savings for Americans who went solar in 2011 were projected to be a little over $20,000. In the populous states of New York, California, and Florida, the projected savings were over $30,000. In the sunny but expensive paradise known as Hawaii, the projected savings were nearly $65,000!

Beyond solar PV panels, it's worth noting that solar energy can actually save you money in about a dozen other ways as well - with proper planning and household design choices.

Solar power provides energy reliability. The rising and setting of the sun is extremely consistent. All across the world, we know exactly when it will rise and set every day of the year. While clouds may be a bit less predictable, we do also have fairly good seasonal and daily projections for the amount of sunlight that will be received in different locations. All in all, this makes solar power an extremely reliable source of energy.

Solar power provides energy security.On top of the above reliability benefit, no one can go and buy the sun or turn sunlight into a monopoly. Combined with the simplicity of solar panels, this also provides the notable solar power advantage of energy security, something the US military has pointed out for years, and a major reason why it is also putting a lot of its money into the development and installation of solar power systems.

Solar power provides energy independence. Similar to the energy security boost, solar power provides the great benefit of energy independence. Again, the "fuel" for solar panels cannot be bought or monopolized. It is free for all to use. Once you have solar panels on your roof, you have an essentially independent source of electricity that is all yours. This is important for individuals, but also for cities, counties, states, countries, and even companies. I was recently in Ukraine touring various cleantech initiatives and projects. While there, I discovered that Ukraine in recent years has saved approximately $3 billion in reduced oil and gas imports from Russia thanks to the solar power plants developed by a single developer. Impressive.

Solar power creates jobs. As a source of energy, solar power is a job-creating powerhouse. Money invested in solar power creates two to three times more jobs than money invested in coal or natural gas. Here's a simple chart on that point:

So, there are 7 big solar power advantages that you should remember and share. There are actually several more, but I think we can leave it at that for today. Let's move on to solar power disadvantages....

Solar Power Disadvantages

Solar power disadvantages are actually not so plentiful. In fact, there's only one notable disadvantage to solar power that I can think of. That disadvantage is that the sun doesn't shine 24 hours a day. When the sun goes down or is heavily shaded, solar PV panels stop producing electricity. If we need electricity at that time, we have to get it from some other source. In other words, we couldn't be 100% powered by solar panels. At the very least, we need batteries to store electricity produced by solar panels for use sometime later.

However, there are a couple of key things to note regarding this solar power disadvantage. Firstly, the sun actually does shine when we need electricity most. As humans (not vampires), our days more or less follow the movement of the sun. Society more or less wakes up when the sun rises. At the time of the sun's greatest height and visibility, humans tend to be most active. At this time, we are of course using much more electricity than in the middle of the night, so electricity is in greater demand. (This also makes electricity more expensive in the middle of the day, making electricity produced from solar panels more valuable.)

Another important point worth noting on this front is that, with storage, solar power could theoretically supply the world with all of its electricity needs. In fact, nothing on earth compares to the energy potential of sunshine:

So, those are the solar power advantages and disadvantages that I think are most notable. Feel free to chime in with something else if you think I missed something.

Tags: jobs, solar energy independence, solar energy reliability, solar energy savings, solar energy security, solar global warming, Solar Jobs, solar power energy independence, solar power energy security, solar power global warming, solar power reliability, solar power savings

About the Author

Zachary Shahan Zach is tryin' to help society help itself (and other species). He spends most of his time here on CleanTechnica as its director and chief editor. He's also the president of Important Media and the director/founder of EV Obsession and . Zach is recognized globally as an electric vehicle, solar energy, and energy storage expert. He has presented about cleantech at conferences in India, the UAE, Ukraine, Poland, Germany, the Netherlands, the USA, and Canada. Zach has long-term investments in TSLA, FSLR, SPWR, SEDG, & ABB - after years of covering solar and EVs, he simply has a lot of faith in these particular companies and feels like they are good cleantech companies to invest in. But he offers no professional investment advice and would rather not be responsible for you losing money, so don't jump to conclusions.

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Advantages & Disadvantages Of Solar Power

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Twitter Google+ LinkedIn Pinterest October 8th, 2013 by Zachary Shahan Originally published on Cost of Solar. Everything has its advantages and disadvantages, its pluses and minuses. So, naturally, there must be a number of solar power advantages and solar power disadvantages too, right?

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Since 1974, SEIA has been the voice of solar energy in the United States. We work with our member companies to promote pro-solar policies and advocate for the growth of solar nationwide.

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Wikipedia solar energy research site

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This article is about radiant light and heat from the Sun that is harnessed using a range of technologies. For more detail about the generation of electricity using solar energy, see Solar power. For the academic journal, see Solar Energy (journal).

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This is a video i found about hydroelectric energy

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Solar energy video below

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How do solar panels work? - Richard Komp

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This is also a kind of sustainible energy that we could use

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This is something kind of interesting

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10 Science Facts You Didn't Learn In School

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top 10 amazing science facts that will blow your mind Subscribe to our channel: http://goo.gl/9CwQhg For copyright matters please contact us at: david.f@valnetinc.com Our Social Media: Facebook: https://www.facebook.com/TheRichest.org Twitter: https://twitter.com/TheRichest_Com Instagram: http://instagram.com/therichest For more videos and articles visit: http://www.therichest.com/

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These are the deadliest, most brutal natural disasters in history. From earthquakes to tsunamis & hurricanes, you'd never believe these violent, destructive acts of nature. Visit http://theywillkillyou.com today! Subscribe for new videos: http://goo.gl/SaufF4 Number 10: The 526 Antioch Earthquake May, 526 AD: the Byzantine Empire-located in the present-day Mediterranean region-is hit hard by a deadly earthquake.

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This is an idea of how we could use a more sustainible energy.