Scientists say Earth is likely to reach more risky levels of warming sooner if the US retreats from its pledge because America contributes so much to rising temperatures.
Guterres announced plans for a summit in 2019 to review progress in implementing the Paris agreement.
Cohn, the Trump economic adviser, also said last week that the president's views were "evolving". But the national targets are voluntary, leaving room for the US and the almost 200 other countries in the agreement to alter their commitments.
"The U.S. traditionally has been an absolute leader on the climate agenda, certainly in the last eight years, and if they do pull out we'll have to see what other countries are prepared to step up on a leadership position on this", he said. "If we can, great". They said the deal would require the USA government to regulate greenhouse gas emissions, which would hurt business.
Trump promised during his 2016 campaign that he'd withdraw the U.S. from the deal.
A United States decision to withdraw from the accord could further alienate American allies in Europe already wary of Trump and call into question U.S. leadership and trustworthiness on one of the world's leading issues.
Trump aides including Steve Bannon, Stephen Miller, lawyer Don McGahn and Peter Navarro, along with EPA chief Pruitt, argued hard for leaving the accord.
Scientists say Earth is likely to reach more risky levels of warming sooner as a result of the president's decision because America's pollution contributes so much to rising temperatures.
Trump should follow through on his commitment and withdraw from an agreement that would do nothing to reduce global carbon dioxide emissions. Standing alongside Chinese Premier Li Keqiang, EU Council President Donald Tusk said Friday, "We are convinced that yesterday's decision by the United States to leave the Paris agreement is a big mistake".
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As the US flirts with fleeing the Paris climate-change accord, Canada is aligning itself with the world's other two largest economies to take a global leadership role in the effort to limit greenhouse gas emissions.
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.
Business investors seemed pleased, with stock prices, already up for the day, bumping higher as he spoke and the Dow Jones industrial average rising 135 points for the day.
Pulling out of the agreement outright would take three-and-a-half years under the standard cooling-off period for new global treaties. That means it could take another three-and-half years for the U.S.to formally withdraw, though Trump promised to stop implementation immediately. So even if the US were to withdraw from the accord, many said the U.S.is not likely to stop reducing its carbon pollution. Beijing, however, has reaffirmed its commitment to meeting its targets under the Paris accord, recently cancelling construction of about 100 coal-fired power plants and investing billions in massive wind and solar projects. But the official says there may be "caveats in the language" that Trump uses to announce the withdrawal - and that could leave open the possibility that the decision isn't final. But Trump's statement was clear and direct.
So was opposition from environmental groups, as expected.
His remarks at New York University's Stern School of Business came at a time when the world waits for Donald Trump to announce whether the country will continue to uphold the Paris deal, which almost 200 countries signed as a commitment to reduce greenhouse gas emissions. European Commission Vice President Maros Sefcovic said this would be disappointing.
Rep. Andy Harris, a Baltimore County Republican and the only Maryland Republican in Congress, hailed Trump's decision. The US president has previously vowed to abandon the deal reached during the tenure of his predecessor Barack Obama. "Any new worldwide climate agreement should be ratified by the U.S. Senate, as outlined in the Constitution".
Niklas Hoehne of Germany's New Climate Institute said a USA pullout could corrode the resolve of other nations, perhaps including hydrocarbon powers Saudi Arabia and Russian Federation.
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