The United States, which historically has pumped more carbon dioxide into the atmosphere than any other country, in April pledged to roughly halve its greenhouse gas emissions by 2030
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When some 200 scientists convened by the United Nations all but demanded on Monday that the nations immediately band together to cut emissions, they portrayed it as a brief window to avert the most catastrophic impacts of climate change.
But as their call ricocheted around the planet, it only underscored the challenge ahead: getting the world’s biggest polluters and its most vulnerable countries to cooperate against a grave global threat.
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