An American withdrawal, promised by Trump during the 2016 US presidential campaign, would deepen a rift with USA allies and put the United States in the same league as Syria and Nicaragua as the world's only non-participants in the landmark 195-nation accord agreed upon in Paris in 2015.
Supporters of the Paris Accord in his inner circle - daughter and adviser Ivanka Trump, son-in-law and most-trusted adviser Kushner and secretary of state Rex Tillersen - had not given up and were expected to press him till the end.
Supporters of the climate pact are concerned that a USA exit could lead other nations to weaken their commitments or also withdraw, softening an accord that scientists have said is critical to avoiding the worst impacts of climate change.
He has also had backlash against his business form anti-Trump customers because of his involvement with the White House.
"It is certainly not a catastrophe and it is also not particularly surprising given what Donald Trump said about climate change during the course of the last United States presidential election".
Paris Agreement also aims to strengthen the ability of countries to deal with climate change impact, and at "making finance flows consistent with a low GHG (Green House Gas) emissions and climate-resilient pathway".
Paris Agreemenmt requires all parties to report regularly on their emission and on their implementation efforts. Scientists have known since the 19th century that burning coal, oil and gas spews carbon dioxide into the air, which then acts like a blanket to trap heat on Earth.
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The U.S. set a target for reducing greenhouse gas emissions by 2025 at 26 to 28 percent below 2005 levels - or about 1.6 billion tons of annual emissions.
Trump has not yet made an official decision to withdraw from the pact, telling reporters Wednesday they will find out soon. Withdrawing would leave the United States as one of just three countries outside the agreement.
Meanwhile on Thursday, the Kremlin also came out in support of the Paris climate deal, saying it would be less effective without major participants. "Mr. Trump believes that because he doesn't know the details". Peskov said Russian Federation has yet to see what announcement Trump makes.
A US pullout would be disappointing but the European Union stands ready to take global leadership on the issue, European Commission Vice President Maros Sefcovic said in Brussels. It is a club for countries who are part of a global effort to tackle unsafe climate change, and who are committed to emissions reductions.
"People die or are obliged to leave their homes because of desertification, lack of water, exposure to disease, extreme weather conditions". But a USA withdrawal from the deal would give China more opportunity to burnish its image as a global leader.
European stakeholders tried to explain the importance of the deal to Trump at the recent G7 summit in Italy, "but it seems our attempts failed", Juncker said. Tesla's Elon Musk threatened to quit White House advisory councils if the president pulls out.
Trump is expected to withdraw from the accord sometime this week.
The statement follows speculation that President Donald Trump may soon announce US withdrawal from the Paris global agreement of 2015 to reduce climate-warming carbon emissions. A study a year ago in the journal Nature Climate Change said America will probably only reach four-fifths of that goal.