To assess the impact of Trump's decision, the questions we need to ask are the following: First, will new policies be enacted after the withdrawal that will significantly alter carbon emissions?
"If such a major emitter as the USA is not going to cooperate entirely then it won't be possible to agree any deal in this area", Putin said. But he indicated that was hardly a priority. "If we can, great".
Kremlin aide Andrei Belousov said the USA move punched a gaping hole in the Paris accord.
"I promised I would exit or renegotiate any deal which fails to serve America's interests", Trump declared in an address watched anxiously by leaders around the world. Calculations suggest withdrawal could result in emissions of up to 2.7 billion tonnes of additional carbon dioxide in the air a year - enough to melt ice sheets faster, raise seas higher and trigger more extreme weather. On Wednesday it made noises about remaining committed to the Paris Agreement and is expected to announce a new collaboration with the European Union to boost energy efficiency and renewables later today.
While Deputy Prime Minister Arkady Dvorkovich said he did not think Trump's decision would prompt Russian Federation to rethink its own stance, the Kremlin suggested the withdrawal could be fatal to the pact.
That's not to say Trump's decision will have no effect. Secretary of State Rex Tillerson and the president's daughter and influential adviser, Ivanka Trump, were among those who counselled him to stay in, perhaps with modifications.
Asian countries fear Trump's move will create a leadership void and leave the agreement, crafted painstakingly over years, at risk of unraveling.
The leaders of France, Germany and Italy joined to "note with regret" the Trump decision and express doubts about any change in the accord.
Carolyn Beeler, The World's environment reporter, noted that Trump's complaints about the Paris agreement represent a narrow view of what's fair when it comes to tackling climate change. Even before Trump's announcement, President Xi Jinping had figured out how to embrace the rhetoric, if not the substance, of global leadership.
"I call on them, come and work here with us to work together on concrete solutions for our climate, our environment", he said.
After the clip ended, Kimmel said, "He does have some support". "Our expectation was that most countries will outperform their [pledges], and I think there's still a reasonable chance that the U.S. will hit their 2025 target anyway".
There is a certain irony in the world's biggest source of greenhouse gases rounding on the United States for turning its back on a climate change accord, especially when China's promises under that accord are not particularly ambitious - while US emissions are already falling.
Even the mayor of Pittsburgh-a city Trump highlighted as a beneficiary of his decision to turn his back on the global pact-vowed to abide by the Paris agreement. There's no denying that all this is helped by strong political incentives, but the global reaction to Trump's decision shows the will is still there. And it is one of the biggest threats to our present world and to the future of our planet.
Since its inauguration, the Trump administration has acquired a reputation for hostility to environmental issues. During Trump's speech, the faint sounds of protesters could be heard in the distance banging drums. The country says it will stick by its commitment to the Paris Agreement, despite the United States' latest move. A White House official said the couple instead attended service at synagogue for the Jewish holiday of Shavuot. The "unsigning" letter his administration sent to the U.N. had uncertain effect under customary worldwide law, the USA signature remains on the Rome Statute, and the United States reengaged with the Rome Statute during the eight years of the Obama Administration.
The US is the world's second largest polluter.
The Paris climate accord "would effectively decapitate our coal industry, which now supplies about one-third of our electric power". But Trump's statement was clear and direct.
THE FACTS: This study was paid for by two groups that have long opposed environmental regulation, the US Chamber of Commerce and the American Council for Capital Formation.
Trump's announcement on Thursday that he would take the United States out of the Paris deal, saying it would undermine the USA economy and cost jobs, drew anger and condemnation from world leaders and heads of industry.