One of the biggest ever environmental campaigns has been launched by a group of the world's most eminent scientists and environmentalists in an 'emergency' effort to convince the President-elect, Donald Trump, that global warming is real before he becomes US President in January.

Mr Trump, who described climate science as a “hoax” perpetrated by China, has already appointed a prominent climate change denier, Myron Ebell, to a key environmental post and promised that he will rip up the landmark Paris Agreement climate deal when he enters the White House. Climate sceptics in Australia crowed that the Paris Agreement was "cactus" – meaning finished – following his election this week.

Among those now preparing for arguably the most important campaign ever designed to change the mind of a single individual in modern history is the Sierra Club – an environmental group founded by legendary conservationist John Muir in 1892, which now has more than two million members and supporters globally.

Visitors to the club's website are now being urging to “make an emergency donation”. “We are not licking our wounds, we are preparing for the fights to come. Fight Back Against Trump,” it explains.

Meanwhile the American Association for the Advancement of Science (AAAS) is bringing together leading scientists from across the US to urge Mr Trump to listen to the evidence, rather than accept the testimonies of conspiracy theorists and fossil fuel lobbyists. Dr Rush Holt, the chief executive of the AAAS, told The Independent: “During the campaign, Trump was all over the place, saying different things about different issues at different times, and so it is hard to know really what he will do.

“There are troubling signs in that he has appointed as a key member of his transition team a person who is, I guess I’d say, antagonistic to restricting carbon emissions [Ebell]. That’s not a good sign. AAAS, for more than half a century, has been outspoken to policymakers and the public about the risks of human-induced climate change and the need to take action to mitigate it.

“I think we will be urging him to look at the evidence even before his first day because climate change is a major, historic, global problem and he should be looking at that even now.”

Dr Holt, who described climate change as a “looming emergency”, said Mr Trump might be swayed by the financial implications of removing the US from the signatories of the Paris Agreement or otherwise abandoning efforts to cut emissions.

“We would condemn such moves and say that such action would put our country and our friends and competitors around the world in dangerous situations and that climate change is already costly in lives and dollars. If strong action isn’t taken, it will be only more so by all estimates, more costly than the cost of addressing it,” he said.

“Maybe he [Trump] would respond to arguments of dollars and cents.”

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Climate scientists have already warned of the dangers of having a climate denier in the White House.

Professor Michael Mann told The Independent that President Trump’s term of office – coupled with new research suggesting the Earth is more sensitive to greenhouse gases than previously thought – could mean “game over” for hopes of preventing global warming from entering dangerous territory.

And Dr Kevin Trenberth, of the US National Center for Atmospheric Research, described the coming Trump presidency as “an unmitigated disaster for the planet”.

John Coequyt, the Sierra Club's director of federal and international climate campaigns, predicted environmentalists would take to the streets. “I at least know there will be lots and lots of protests on this with the goal to change his position on it,” he told The Independent.

“I think we’ll put together the largest defensive legislative campaign the progressive community has ever put together in Washington DC. It will span all the issues the progressive community cares about form healthcare to climate change to gay rights to immigration.”

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But Mr Coequyt said Mr Trump was surrounding himself with advisers with links to the fossil fuel industry and so politicians from other countries might actually be able to exert greater influence. “Right now, all of the people who have been identified as senior advisers, potentially take roles in cabinet, they are all fossil fuel lobbyists and people who run these companies. That’s going to be the big challenge,” he added.

“The only people who have a word in his ear are fossil fuel industry insiders. It’s international pressure that’s going to be the most effective. Domestically he’s got advisers who will insulate him from the reality of the world.”

He said that the US military would be another “voice of reason” in close contact with the new President.

“They have for some time believed climate change is a ‘force multiplier’, it’s very clear they believe it is driving instability around the world,” Mr Coequyt said. “I don’t think they are going to give up that position easily. It’s now a 15-year-old position.”

Donald Trump's most controversial quotes Show all 14 1 /14 Donald Trump's most controversial quotes Donald Trump's most controversial quotes On Isis: "Some of the candidates, they went in and didn’t know the air conditioner didn’t work and sweated like dogs, and they didn’t know the room was too big because they didn’t have anybody there. How are they going to beat ISIS?" Getty Donald Trump's most controversial quotes On immigration: "I will build a great wall — and nobody builds walls better than me, believe me —and I’ll build them very inexpensively. I will build a great, great wall on our southern border, and I will make Mexico pay for that wall. Mark my words." Reuters Donald Trump's most controversial quotes On Free Trade: "Free trade is terrible. Free trade can be wonderful if you have smart people. But we have stupid people." PAUL J. RICHARDS | AFP | Getty Images Donald Trump's most controversial quotes On Mexicans: "When Mexico sends its people, they’re not sending their best. They’re sending people that have lots of problems. They’re bringing drugs. They’re bringing crime. They’re rapists." Getty Donald Trump's most controversial quotes On China: "I just sold an apartment for $15 million to somebody from China. Am I supposed to dislike them?... I love China. The biggest bank in the world is from China. You know where their United States headquarters is located? In this building, in Trump Tower." Getty Images Donald Trump's most controversial quotes On work: "If you're interested in 'balancing' work and pleasure, stop trying to balance them. Instead make your work more pleasurable." AP Donald Trump's most controversial quotes On success: "What separates the winners from the losers is how a person reacts to each new twist of fate." Donald Trump's most controversial quotes On life: "Everything in life is luck." AFP Donald Trump's most controversial quotes On ambition: "You have to think anyway, so why not think big?" Getty Images Donald Trump's most controversial quotes On his opponents: "Bush is totally in favour of Common Core. I don't see how he can possibly get the nomination. He's weak on immigration. He's in favour of Common Core. How the hell can you vote for this guy? You just can't do it." Reuters Donald Trump's most controversial quotes On Obamacare: "You have to be hit by a tractor, literally, a tractor, to use it, because the deductibles are so high. It's virtually useless. And remember the $5 billion web site?... I have so many web sites, I have them all over the place. I hire people, they do a web site. It costs me $3." Getty Images Donald Trump's most controversial quotes On Barack Obama: "Obama is going to be out playing golf. He might be on one of my courses. I would invite him. I have the best courses in the world. I have one right next to the White House." PA Donald Trump's most controversial quotes On himself: "Love him or hate him, Trump is a man who is certain about what he wants and sets out to get it, no holds barred. Women find his power almost as much of a turn-on as his money." Getty Images Donald Trump's most controversial quotes On America: "The American Dream is dead. But if I get elected president I will bring it back bigger and better and stronger than ever before and we will make America great again." GETTY

Deborah Barker-Manase is representing the Republic of the Marshall Islands – a Pacific island state already experiencing the effects of climate change – at the ongoing United Nations climate summit in Morocco.

She spelled out the kind of problems that that are also beginning to hit many parts of the world.

“We’re experiencing frequent storm surges … anything just above the normal average high-water tide has a very big impact because we are no more than two metres above sea level,” Ms Barker-Manase said.

“And we are experiencing prolonged drought events, which for an atoll nation is pretty serious even if it is a month long because there are no freshwater sources other than rain.

“I think it’s not a matter of convincing someone … you just have to look around.”

British politicians were scathing of Mr Trump.

'Dangerous' climate change could arrive as early as 2050

Barry Gardiner, Labour’s shadow minister for international climate change, said “even though a Trump administration will present a significant threat to continued action at the federal level in the USA, it cannot hold back the global tide that is sweeping us to a low-carbon future”.

“I will be calling on Theresa May to make clear to Mr Trump that the world expects the USA to stay solidly behind the Paris Agreement,” he added.

Liberal Democrat leader Tim Farron said Mr Trump was “frankly is a disaster for our future”, particularly as Congress is controlled by the Republicans.

“He has talked about ripping our climate change agreements, rolling back green energy schemes and downsizing the Environment Protection Agency,” Mr Farron said. “He is not only mad and bad but he’s also dangerous and this is exhibit A.”

And Green Party co-leader described Mr Trump's election as “a potential hammer blow to the climate movement”.