The Government has pledged tax payer money to the Green Climate Fund on the heels of similar pledges from the USA, Germany, France, Japan, China and a number of other countries.
Christian Aid's Principal Climate Change Advisor, Alison Doig, said: "It is right that the UK joins with other global economic powers to support the world's poorest people, who are experiencing the effects of climate change right now. In the past, the UK has been a front-runner in providing this life-saving finance and now other countries are getting on board.
"The important purpose of this new Green Climate Fund is to deliver benefits to the most vulnerable people around the world, such as early warning systems for hurricanes in the Philippines, essential weather information to farmers in dry areas of Kenya and clean energy to millions of people off the electricity grid.
"This injection of climate funding, which follows on the heels of the historic emissions pact between the USA and China, and the EU's commitment to cut carbon emissions by 2030, shows that momentum is building across the world to address this global problem.
"These pledges will also hopefully unlock the international negotiations resuming in Lima, Peru, on December 1st, where countries will lay the groundwork for a global climate deal to be agreed in Paris next year.
"However, this is part of a long-term commitment, and if the Green Climate Fund is to play its vital role then governments must look to delivering continuous and scaled-up funding for the rest of the decade and beyond."