Here's how he's handled other global pledges.
Trump's decision fulfills a campaign promise, but it dampens worldwide efforts to slow global warming. The world can continue to count on Europe for global leadership in the fight against climate change. Some scientists say that the effect would be limited if the USA - which produces about 18 percent of global emissions - withdraws and continues to reduce its output of harmful gases.
President Donald Trump has announced that the US will withdraw from the Paris climate agreement, but will begin negotiations to "re-enter either the Paris accord or an entirely new transaction". If the USA does leave, he said, the Europe Union should seek ways to balance out the economic advantage that US companies might have from the absence of climate regulations. And how this affects USA relations with our allies on other issues like trade and defense will be another one - a practical effect that remains to be seen.
U.S. Rep. Tom MacArthur, R-N.J.
"The rest of the world might literally put on some kind of a tariff and say we're embracing carbon pricing strategies", said Vicki Arroyo of the Georgetown University Climate Center.
"Everyone is impacted and if we do nothing our children will know a world of migrations, of wars of shortage, a risky world, it is not the future we want for ourselves, it is not the future we want for our children, it is not the future we want for our world".More news: Eleven-year-old Alex submits Ireland's 2023 Rugby World Cup bid
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U.S. Rep. Frank Pallone, D-N.J.
Obama is defending the deal that his administration painstakingly negotiated. He said it would also lead to a reduction in cement, iron, steel, coal, natural gas and petroleum production. But according to some scientists, the U.S.' highly symbolic exit from the climate accord could have severe repercussions, according to some experts.
House Democratic Leader Nancy Pelosi (D-California) said the move was not good for the US economy. "Today's decision is a setback for the environment and for the US's leadership position in the world", he wrote. He released the statement as President Donald Trump was speaking at the White House Rose Garden.
"The EU deeply regrets the unilateral decision by the Trump administration", he said in a statement.
John Schellnhuber, the director of the Potsdam Institute for Climate Impact Research, told the Associated Press that the U.S.' withdrawal from the Paris accord isn't the end of the world. Andrew M. Cuomo of New York, Jerry Brown of California and Jay Inslee of Washington of the creation of the United States Climate Alliance, a coalition of states pledging to uphold the Paris accord and to aggressively fight climate change.