President Donald Trump on his first day in office again withdrew the U.S. from a landmark global pact to fight climate change. So what is the Paris Agreement? And what happens to it now?

U.S. withdrawal from the world's primary climate pact will have a bigger impact - in the U.S. and globally - than the country's first retreat in 2017, analysts and diplomats told Reuters.

President Trump announced the withdrawal of the U.S. from the Paris Climate Agreement on Monday shortly after his inauguration, echoing a similar decision in his first term that was later reversed