The United Nations' COP climate talks are "no longer fit for purpose" and need an urgent overhaul, key experts including a former UN secretary general and former UN climate chief have said. In a letter to the UN, senior figures say countries should not host the talks if they don’t support the phase out of fossil energy.

At the United Nations climate talks in Baku, Azerbaijan, wars are top of mind for some leaders and activists who have converged to discuss ways to limit global warming.

For the third straight year, efforts to fight climate change haven't lowered projections for how hot the world is likely to get — and recent developments in China and the United States are likely to slightly worsen the outlook,

For the third straight year, efforts to fight climate change haven't lowered projections for how hot the world is likely to get — even as countries gather for another round of talks to curb warming, according to an analysis Thursday.