The world is getting serious about climate. Is it too late?

Climate Week, the annual carbon-cutting confab in New York City, long has been a time for governments and companies to announce their green ambitions. But even by its own standards, this year's edition seemed to reflect a new sense of urgency to address a warming planet. "Other countries like Brazil and Australia got political cover to reverse policies under Trump," said Joshua Busby, a professor of public affairs at the University of Texas, Austin. "Even China faced less pressure to up ambition. Subnational action can't fully compensate for loss of federal momentum."