Donald Trump is a known doubter of climate change, and while his professions of climate change being a hoax aren’t as quotable as, say, Sarah Palin’s, he may be the only world leader to doubt the phenomenon, should he be elected U.S. president.

The world widely recognizes climate change; Trump doesn't.

According to research from the Sierra Club set to be published Tuesday, the presumptive Republican presidential nominee’s views on climate science are drastically different from those of the 195 leaders recognized by the State Department.

Indeed, Trump would be the only climate change doubter among world leaders if he wins the 2016 U.S. presidential elections, having called it a “con job” and a “myth” in previous public statements.

Sharp contrasts.

That’s a sharp contrast from America’s allies, whose leaders have repeatedly been quoted as saying the world needs to do more to reduce greenhouse gas emissions. China, which leads the world in carbon emissions, has pledged to phase out coal power plants, and is working on initiatives to build more solar panels and wind turbines as alternative sources of energy.

Even North Korean dictator Kim Jong-un signed off on last year’s Paris climate treaty, and has his own forest-planting initiative as part of a ten-year plan to “mitigate climate change.” Oil-producing nations are also cognizant of the fact that global warming is still a clear and present danger, as the world’s temperatures continue to heat up.

“Being highly vulnerable to climate change and actions and plans to address it, the Kingdom of Saudi Arabia will be engaged in several actions to address climate change and make its development more sustainable,” said the Saudi state government in prepared remarks from 2015.

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Donald Trump

Trump's flippant climate change disses still quotable.

That all goes very much against Trump’s media statements, and his plans to undo what America had achieved as part of the Paris accord. Apart from that, he firmly believes that the world isn’t really getting warmer, bringing up frigid winters as proof that climate science in general is, in his view, not real. But he has been most quotable with regards to the topic when claiming the phenomenon is a myth propagated to destabilize the U.S. economy.

“The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive,” read one 2012 tweet from Trump. “The entire country is FREEZING — we desperately need a heavy dose of global warming, and fast! Ice caps size reaches all time [sic] high,” said Trump in another tweet a couple of years later.

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