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Tangshan, China’s leading steel manufacturing city, has some of the dirtiest air in the country, a challenge to efforts to curb climate change. CreditXiaolu Chu/Getty Images 

Despite overwhelming scientific evidence that the world’s climate is changing, the president-elect of the United States, Donald J. Trump, has long been on the side of the deniers.

In 2012, he posted on Twitter a couple of messages that asserted that climate change was a hoax that China had devised to secure an unfair trade advantage, presumably because the Obama administration was seeking to curb coal consumption in the United States.

“The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive,” Mr. Trump wrote. That message has been reshared more than 104,000 times and “liked” nearly 66,000 times.

On Wednesday, a deputy foreign minister of China, Liu Zhenmin, told reporters at a climate conference in Marrakesh, Morocco, that starting from the 1980s, the administrations of Mr. Trump’s Republican predecessors — Presidents Ronald Reagan and George Bush — supported climate change negotiations under a United Nations panel.

That was apparently an important moment in China’s realization of the onset of climate change.

Mr. Liu said that President Xi Jinping brought up the issue in his call with Mr. Trump on Monday, saying that China would continue its struggle to curb climate change “whatever the circumstances,” according to Bloomberg News.

China’s lecturing the United States on the need to fight climate change is a reversal from the usual roles and a sign that, with the United States governed by Mr. Trump, China may have to take the leadership position in the global campaign.

PhotoLiu Zhenmin, a deputy foreign minister of China.CreditHow Hwee Young/European Pressphoto Agency 

Under President Obama, the United States government persuaded China to announce important pledges in the fight against climate change. In 2014, Mr. Xi stood next to Mr. Obama in Beijing and said that China would ensure that its greenhouse gas emissions peaked by 2030 and that 20 percent of its energy would come from non-fossil fuel sources by that year. Mr. Obama pledged to greatly reduce coal use by 2025.

Diplomats and climate negotiators have been meeting in Marrakesh this week to discuss steps needed to carry out the Paris climate agreement, which was negotiated last year and which China and the United States signed this year. There has been much anxiety over whether Mr. Trump might try to withdraw the United States from the pact after he takes office.

But the agreement now has enough countries as signatories to make it legally binding, and Mr. Trump may have a hard time extricating the United States from the deal. In addition, other countries have said they intend to go ahead with the plan on their own

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