Because he is determined to do as much damage to the world as humanly possible:
Washington (CNN)President Donald Trump is expected to withdraw from the Paris climate agreement, two senior US officials familiar with his plans told CNN Wednesday, a major break from international partners that would isolate the United States in global efforts to curb global warming.
The decision, which will be announced this week, would put the US at odds with nearly every other nation on earth. It would reflect a major reversal of the Obama administration’s efforts on climate change. And it could trigger further efforts to erode the landmark climate agreement.
Cov•fe•fe /'kov,f?,f?/ noun: A ploy to distract from pulling out of the #ParisAgreement.
— Eric Wolfson (@EricWolfson) May 31, 2017