UN climate chief: pledges by big polluters boost Paris hopes

The U.N.'s climate chief says deadlines set by some of the world's top polluters to end greenhouse gas emissions, along with president-elect Joe Biden's pledge to take the United States back into the Paris accord, have boosted ...

US formally exits Paris pact aiming to curb climate change

The United States on Wednesday formally left the triggered by his administration a year ago, further isolates Washington in the world but has no immediate impact on international efforts to curb global warming.

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