But Trump doesn't appear to take the threat of climate change seriously.
There was a mix of dismay and anger across the world.
"Americans don't need Washington to meet our Paris commitments, and Americans are not going to let Washington stand in the way of fulfilling it", Bloomberg said following a meeting with French President Emmanuel Macron and Paris Mayor Anne Hidalgo on Friday.
German Chancellor Angela Merkel, a pastor's daughter who is usually intensely private about her faith, said the accord was needed "to preserve our Creation". But like an unwanted suitor who keeps sending you late-night "hey" s until you're forced to block the idiot, Trump keeps trying to court the city anyway, forcing Mayor Bill Peduto to go full Mariah and say "I don't know her" to Trump's coal-country talking points. The head of the World Meteorological Organization's atmospheric research and environment department, Deon Terblanche, underscored however that the likely impact of US President Donald Trump's widely-condemned decision remains far from clear.
Kremlin aide Andrei Belousov said the U.S. move punched a gaping hole in the Paris accord.
China emerged as Europe's unlikely partner in this and in other areas - underlining Mr Trump's isolation on many issues.
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"There is no reverse gear to energy transition". "Because this is not only the right thing to do, it is the smart thing to do, and those that will be betting on the implementation of the Paris Agreement, on the green economy, will be the ones that have a leading role in the economy of the 21st century", he said.
A small group of sceptics - some of whom are in the Trump White House - believe this is a hoax and one that could be damaging to business.
Mr. Trump: "The cost to the economy at this time would be close to $3 trillion in lost GDP and 6.5 million industrial jobs".
Referring to "the latest unfortunate decisions of the new administration", Tusk said that the European Union and China had "demonstrated solidarity with future generations and responsibility for the whole planet" by reaffirming their climate change commitment. "Industry must now lead".
With the USA withdrawing from the deal, Elon Musk, CEO of Tesla and SpaceX, has quit two of the president's business advisory councils.
"Climate protection can be pushed forward in an effective and competition-friendly way only by all states", said DIHK President Eric Schweitzer.
Not knowable: This study was paid for by two groups that have long opposed environmental regulation, the U.S. Chamber of Commerce and the American Council for Capital Formation.
In a memo to Apple employees obtained by CNET, Cook wrote that he spoke with Trump earlier in the week in an effort to persuade him not to withdraw from the pact, in which almost 200 countries agreed to fight global warming by reducing carbon emissions.