At the United Nations climate talks, hosted in Baku, Azerbaijan, nations are trying to set new targets to cut emissions of heat-trapping gases and figure out how much rich nations will pay to help the world with that task.

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,

The meeting just getting underway in Azerbaijan won't have the top leaders of the 13 largest carbon dioxide-polluting countries.