The Tesla billionaire is a key figure in the president-elect’s orbit. One question is whether his views on climate and clean energy will have any sway.

© Doug Mills/The New York Times

A new report, urging rich nations to give more climate aid to poorer ones, comes as Donald Trump’s election throws global climate talks into disarray.

© Mohammad Ponir Hossain/Reuters

A surge in power use worldwide could make it harder for nations to slash emissions and keep global warming in check.