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Republican U.S. presidential candidate Donald Trump poses for a photo after an interview with Reuters in his office in Trump Tower, in the Manhattan borough of New York City, May 17, 2016. REUTERS/Lucas Jackson

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By Alister Doyle and Valerie Volcovici

OSLO/WASHINGTON (Reuters) - Donald Trump's vow to renegotiate the global accord on climate change if elected U.S. president caused dismay abroad on Wednesday, with supporters of the deal saying it was in his interests to embrace a plan that seeks to end dependence on fossil fuels.

U.S. insistence on renegotiation could unravel a 195-nation compromise to curb greenhouse gas emissions reached in Paris in December after fraught talks between nations as different as China, the United States, small island states and OPEC members.

"The Paris Agreement is as much in the United States’ interests as any other country," said Tony de Brum, ambassador for climate change of the Marshall Islands who, as his country's foreign minister, helped broker the U.N. deal.

"Seeking to unravel it would not only threaten the U.S. economy, damage its environment, and weaken its security, but it would do a great disservice to all of humanity," he said.

Trump, the presumptive Republican presidential nominee, told Reuters on Tuesday he was "not a big fan" of the climate accord.

He said China and other countries would not stick to the "one-sided" deal, which seeks to transform the world economy from fossil fuels in coming decades to slow global warming.

"I will be looking at that very, very seriously, and at a minimum I will be renegotiating those agreements, at a minimum. And at a maximum I may do something else," he said.

Trump has said in the past he believes global warming is a concept that was invented by China to hurt the competitiveness of U.S. business.

Government officials meeting in Bonn, Germany, from May 16-26 to find ways to implement the deal, raised concerns about Trump's comments but doubted he would take serious action.

That's because the deal imposes no real constraints on the United States - it lets all nations define their own actions for fighting climate change. President Barack Obama has promised to cut emissions by 2025, but his successors will face no penalties if they do not comply, meaning little incentive to challenge the U.N. deal.

Many officials also say it is in U.S. interests to limit greenhouse gas emissions, partly because cuts in the use of fossil fuels also means less air pollution, a big cause of disease. Even many nations traditionally sceptical that man-made greenhouse emissions stoke climate change, like OPEC countries, have gone along with the Paris Agreement.

RENEGOTIATING UNTHINKABLE

George David Banks, a senior climate change adviser to President George W. Bush and a Trump supporter, said Trump could try to force countries like China to pledge deeper emissions cuts by renegotiating the agreement.

That's wishful thinking, according to John Coequyt, director of green group the Sierra Club’s international climate campaigns.

"You can't get more than 190 countries to renegotiate a deal they are implementing,” he said.

The Paris Agreement will formally enter into force when 55 nations representing at least 55 percent of world greenhouse gas emissions have ratified it. China and the United States, representing 38 percent, say they will join this year.

If the deal enters into force before the next U.S. president takes office next year, it will in theory be harder to pull out. Article 28 says any nation wanting to leave has to wait four years from the date of entry into force - the length of a U.S. presidential term.

Trump's easiest option is to neglect the deal if elected, legal experts say. Trump could ignore the targets set by Obama and promise instead to help developing nations cope with global warming.

The Paris Agreement's flexible approach, allowing all to set their own goals, is radically different from the U.N.'s 1997 Kyoto Protocol, which set mandatory targets for developed nations to cut emissions until 2012. The United States did not take part in Kyoto - President George W. Bush denounced it as an economic straitjacket that, he said, unfairly omitted targets for developing nations led by China and India.

Former French foreign minister Laurent Fabius, who helped broker the Paris deal, said this month that the U.S. election was critical to its future. "If a climate change denier was to be elected, it would threaten dramatically global action against climate disruption," he said.

But U.S. chief climate envoy Jonathan Pershing said last week that other nations were likely to push ahead with the Paris Agreement whoever wins the White House.

(Reporting By Alister Doyle; Editing by Angus MacSwan and Ross Colvin)

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