But he said that the poorest nations, from Afghanistan to Zambia, had no plans to quit the Paris Agreement.
France said it would work with USA states and cities - some of which have broken with Trump's decisions - to keep up the fight against climate change. Economists, however, say that the climate deal would likely help create about as many jobs in renewable energy as it might cost in polluting industries. "And they won't be", Trump said.
"It is imperative to avoid undermining global agreements such as the Paris agreement, which is a global symbol of joint cooperation and has strengthened multilateralism".
However, May didn't join with the leaders of France, Germany and Italy, who together condemned Trump's decision.
Trump's decision Thursday was applauded by some conservatives and the US energy industry - who have argued that the deal would be a job-killing drain on the USA economy.
"We worked really hard in South Florida.to really try to do our part in containing the issues that have to do with human-induced climate change", she said.
In Paris, the venue for the pact, French President Emmanuel Macron turned Trump's "Make America Great Again" campaign slogan on its head, saying in a rare English-language statement that it was time to "make the planet great again". Criticizing Trump in a personal capacity, and not on behalf of the bipartisan panel that advises Congress, she added: "He's just making it easier for them by pulling the USA back from the position of global responsibility".
Though China's stance has changed little, its diplomatic position was enhanced first in Paris, where joint pledges made by Presidents Barack Obama and Xi Jinping helped push the deal over the line, and now by its efforts to keep the Paris agreement in play in the face of US opposition. What steps could have been taken instead of the withdrawal?
He also ordered the Environmental Protection Agency to review, with an eye on overturning, Obama's cornerstone action for meeting the USA commitments under the Paris deal, the Clean Power Plan.
Kimmel also noted the only two countries not on board the accord, which unifies nations in an effort to combat climate change, are Nicaragua and Syria. "Chemical manufacturers will continue to meet global demand for materials and technologies that improve energy efficiency and reduce emissions", the industry group American Chemistry Council said.
A long-scheduled meeting today between Chinese Premier Li Keqiang and top European Union officials in Brussels was dominated by Trump's decision. Specifically, it requires countries to set their own targets for reducing emissions by 2020.