...The UK's contribution (click here) will come from the £3.87bn budget set aside in the aid budget from 2011-2016 for helping poor countries get clean energy and adapt to climate change.
In Bangladesh for example, British cash is helping landless people living in precarious temporary sandbanks that appear for a few years in the middle of rivers.
The cash pays them to build their homes on earth platforms so their possessions are safe from flooding which is expected to get worse with climate change.
UK Prime Minister David Cameron has been under pressure from critics who say the UK should spend the money helping combat the effects of extreme weather at home.
The fund was agreed because developed nations have caused the majority of global warming so far - and their CO2 emissions stay in the atmosphere for 100 years. Poor countries asked for help to adapt to climate change they have not caused.
But as greenhouse gas emissions are a global problem, rich nations acknowledge a degree of self-interest in helping developing countries to invest in clean technology....
