Trump's Big Paris Mistake

Any rational, responsible business leader, faced with an existential threat to his enterprise, would take steps to manage the risk. With his decision to leave the Paris climate accord, President Donald Trump is putting the lie to one of his central claims: that he would run the country like a business.

The Earth is threatened with rising seas, violent weather and punishingly high temperatures. Rather than remain part of the world's cooperative plan to address this danger, Trump is working to undermine it.