But humanity is not close either to the IPCC’s most optimistic scenario, which calls for global carbon emissions to be cut to “net zero” around the midway point of this century. Attention is shifting to a November summit in Glasgow, Scotland, where world leaders are facing mounting pressure to act. “It’s more serious than it’s ever been, at a time that it seems as if some key nations are just unwilling to do their part, to bite the bullet and step up,” John F. Kerry, the Biden administration’s chief climate official, said last week. “I view this as the last, best hope for the world to get serious.”

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