Leaders from around the world—with the notable exception of the U.S.—are on their way to Belém, Brazil, for the 30th United Nations Climate Change Conference, COP30.

The talks come on the heels of the world’s warmest two years and record high emissions of greenhouse gases. International relationships, meanwhile, are strained by wars, trade battles and deep disagreement over the future direction of the energy economy.

The U.S., one of the world’s biggest sources of climate pollution, will not have an official federal government presence at the talks, as President Donald Trump is scrapping clean energy and climate science programs and withdrawing the country from the landmark Paris Climate Agreement.

The Paris Agreement hits its 10 th anniversary and COP30 brings an important deadli

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