A new UN report suggests that atmospheric levels of carbon dioxide had not been this high in at least 2 million years, and the past decade is likely the hottest the planet has been in 125,000 years
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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