The White House signalled that Trump was likely to decide on exiting the global pact - fulfilling one of his principal campaign pledges - though top aides were divided.
While Trump now favors an exit, he has been known to change his thinking on major decisions and tends to seek counsel from a range of inside and outside advisers, many with differing agendas, until the last minute. Environment Minister Catherine McKenna is pictured after delivering a policy announcement in Toronto, on Wednesday May 31, 2017. Elon Musk, the CEO of Tesla, tweeted that if Trump does leave the accord, he would have "no choice but to depart councils" on which he has advised the President in the past.
Guterres said the United Nations was engaged with the USA administration and Congress to try to convince them to abide by the agreement. "Clime action is unstoppable".
"They're going to make their own decision, but we all need to be moving forward".
Almost 200 nations, including the US, agreed in 2015 to voluntarily reduce their greenhouse gas emissions.
Guy Verhofstadt, leader of the liberal group in the European Parliament, sent a tweet in the literary style of the US president: "Trump puts his ego ahead of the future of our planet - sad!"
American corporate leaders have also appealed to the businessman-turned-president to stay.
Hundreds of high-profile businesses have spoken out in favor of the deal, including Apple, Google and Walmart. So even if the USA were to withdraw from the accord, many said the U.S.is not likely to stop reducing its carbon pollution.
While Trump and Pence have suggested the possibility of renegotiating the agreement, the leaders of Italy, Germany and France have said that won't happen.
Last weekend President Trump left the G7 summit in Sicily without reaffirming his commitment to the accord, unlike the other six world leaders in attendance.
Droughts and dry spells will last longer, while natural disasters like floods and hurricanes will be even more destructive, he said. "This notion, 'I am Trump, I am American, America first and I am getting out, ' that is not going to happen".
Trump was critical of the deal during his campaign and has been considering whether to remain in the pact.
Trump's administration has already begun killing Obama-era climate regulations.
"One of the topics that they discussed, of course, was the President's upcoming decision on the Paris Climate Accords", White House Press Secretary Sean Spicer told reporters at his daily news conference. Senior adviser Jared Kushner generally thinks the deal is bad but still would like to see if emissions targets can be changed.
Cavaliers wearing black jerseys for Game 2: 2017 NBA Finals
They are obviously trying to get to the ball as much as possible and I expect them to play even more physical on Sunday. He attended the pregame news conference and said he had not yet told his players that he would be back coaching.
Although the officials caution no decision is final until the president officially announces it, the White House is now working on how to roll out the announcement and explain the reasons behind Trump's decision.
Jean-Claude Juncker said that "the Americans can't just get out of the agreement", adding that "it takes three to four years" to pull out.
Trump has several options, climate experts said.
He also said that he would engage more with major actors - the coal, oil and gas industries - to accelerate the global transition to sustainable energy, and committed stronger support to governments as they strive to meet climate commitments and achieve the 2030 Agenda for Sustainable Development and the Sustainable Development Goals.
Moreover, the accord is flexible in the sense that it does not mandate that any nation achieve any particular level of emissions cuts.
Under the agreement, the USA had agreed to reduce the country's pollution emissions to 26 percent to 28 percent of 2005 levels by 2025 - about 1.6 billion tons.
Pelosi says most Americans - regardless of political affiliation - want clear, decisive action to arrest the effects of climate change.
In a joint statement issued following talks in the Spanish capital between Indian Prime Minister Narendra Modi and Spanish counterpart Mariano Rajoy, the two countries said taking action on climatic change was a priority for both nations.
"Climate change is undeniable. Climate solutions provide opportunities that are unmatchable". "The falling cost of renewables is one of the most encouraging stories on the planet today", he said adding that in the United States and China, new renewable energy jobs now outstrip those created in the oil and gas industries.
Pope Francis, with whom he met a week ago in the Vatican, gave Trump a copy of his encyclical on climate change during the meeting.
Since taking office, Trump and Pruitt have moved to delay or roll back federal regulations limiting greenhouse gas emissions while pledging to revive the long-struggling US coal mines.
The decision to withdraw from the climate accord was influenced by a letter from 22 Republican U.S. senators, including Majority Leader Mitch McConnell, calling for an exit, Axios reported. "It is a tough reality which affects peoples' daily lives", European Parliament President Antonio Tajani said in a statement.
- With files from The Canadian Press.
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