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?

Trump signed an executive order that begins the process of withdrawing from the Paris Climate Agreement, which he also did during his first term.

President Donald Trump is once again withdrawing the United States from the Paris climate accords, pulling the nation whose factories, cars and power plants contributed the most cumulative planet-heating pollution to the atmosphere out of the first global pact to slash carbon emissions enough to prevent the world’s average temperature from reaching dangerous new heights.