David Cameron says cash spread over five years will come out of foreign aid budget as he meets Ban Ki-moon and François Hollande at UN
Observers say superpower's latest pledge is 'gamechanger' for efforts to tackle climate change
Pontiff praises UN Sustainable Development Goals and urges world leaders to ensure Paris Summit delivers 'fundamental and effective agreements'
New Commission will seek to help governments tackle climate change and boost economic growth, but green groups remain sceptical of its true aims
Businesses are aware of the UN's ambitious new development goals, but are they developing coherent strategies to ensure they are met?
Unilever chief executive explains how businesses can play a critical role in ensuring the UN's new development targets are met
World Energy Council business group says carbon pricing is essential to boosting green investments
Microsoft, Sony, Adidas and Marks & Spencer amongst businesses backing new Climate Neutral Now initiative
Leonardo DiCaprio pledges to divest from fossil fuels, as latest figures suggest trillions of dollars of investments now actively excluding fossil fuel assets