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World leaders agreed measures at the Paris Summit http://www.bbc.co.uk/news/science-environment-35073297

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What was agreed as part of the Paris climate deal?

Overview

The deal unites all the world's nations in a single agreement on tackling climate change for the first time in history.

Coming to a consensus among nearly 200 countries on the need to cut greenhouse gas emissions is regarded by many observers as an achievement in itself and has been hailed as "historic".

The Kyoto Protocol of 1997 set emission cutting targets for a handful of developed countries, but the US pulled out and others failed to comply.

However, scientists point out that the Paris accord must be stepped up if it is to have any chance of curbing dangerous climate change.

Pledges thus far could see global temperatures rise by as much as 2.7C, but the agreement lays out a roadmap for speeding up progress.

What are the key elements?

To keep global temperatures "well below" 2.0C (3.6F) above pre-industrial times and "endeavour to limit" them even more, to 1.5C
What's in and what has been left out?

To limit the amount of greenhouse gases emitted by human activity to the same levels that trees, soil and oceans can absorb naturally, beginning at some point between 2050 and 2100

To review each country's contribution to cutting emissions every five years so they scale up to the challenge

For rich countries to help poorer nations by providing "climate finance" to adapt to climate change and switch to renewable energy.

The goal of preventing what scientists regard as dangerous and irreversible levels of climate change - judged to be reached at around 2C of warming above pre-industrial times - is central to the agreement.

The world is already nearly halfway there at almost 1C and many countries argued for a tougher target of 1.5C - including leaders of low-lying countries that face unsustainable sea levels rises in a warming world.

The desire for a more ambitious goal has been kept in the agreement - with the promise to "endeavour to limit" global temperatures even more, to 1.5C.

Dr Bill Hare, CEO of Climate Analytics, says the objective is "remarkable".

"It is a victory for the most vulnerable countries, the small islands, the least developed countries and all those with the most to lose, who came to Paris and said they didn't want sympathy, they wanted action."

Meanwhile, for the first time, the accord lays out a longer-term plan for reaching a peak in greenhouse emissions "as soon as possible" and achieving a balance between output of man-made greenhouse gases and absorption - by forests or the oceans - "by the second half of this century".

"If agreed and implemented, this means bringing down greenhouse-gas emissions to net zero within a few decades. It is in line with the scientific evidence we presented," says John Schellnhuber, Director of the Potsdam Institute for Climate Impact Research.

Some have described the deal as "woolly" because some of the targets were scaled down during the negotiations.
What about money?
"The Paris Agreement is only one step on a long road, and there are parts of it that frustrate and disappoint me, but it is progress," says Greenpeace International executive director Kumi Naidoo.

"This deal alone won't dig us out the hole we're in, but it makes the sides less steep."

Money has been a sticking point throughout the negotiations.

Developing countries say they need financial and technological help to leapfrog fossil fuels and move straight to renewables.

Currently they have been promised US $100bn (£67bn) a year by 2020 - not as much as many countries would like.

The agreement requires rich nations to maintain a $100bn a year funding pledge beyond 2020, and to use that figure as a "floor" for further support agreed by 2025.

The deal says wealthy countries should continue to provide financial support for poor nations to cope with climate change and encourages other countries to join in on a voluntary basis.

Dr Ilan Kelman of UCL, London, says the lack of time scales is "worrying".

"The starting point of $100bn per year is helpful, but remains under 8% of worldwide declared military spending each year."

What happens next?

Only elements of the Paris pact will be legally binding.

The national pledges by countries to cut emissions are voluntary, and arguments over when to revisit the pledges - with the aim of taking tougher action - have been a stumbling block in the talks.

The pact promises to make an assessment of progress in 2018, with further reviews every five years.

As analysts point out, Paris is only the beginning of a shift towards a low-carbon world, and there is much more to do.

"Paris is just the starting gun for the race towards a low-carbon future," says WWF-UK Chief Executive David Nussbaum.

Prof John Shepherd of the National Oceanography Centre, University of Southampton, says the agreement includes some welcome aspirations but few people realise how difficult it will be to achieve the goals.

"Since the only mechanism remains voluntary national caps on emissions, without even any guidance on how stringent those caps would need to be, it is hard to be optimistic that these goals are likely to be achieved."

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What was agreed as part of the Paris climate deal? The deal unites all the world's nations in a single agreement on tackling climate change for the first time in history. Coming to a consensus among nearly 200 countries on the need to cut greenhouse gas emissions is regarded by many observers as an achievement in itself and has been hailed as "historic".

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things we do to cope with the impacts of global warming

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things which can reduce the causes of global warming