One 2009 study found that the United States saw roughly as many record highs as record lows in the 1950s, but b y the 2000s there were twice as many record highs as record lows. Severe cold snaps were still happening, but they were becoming less common.
“Of course it sometimes gets very cold,” said Todd D. Stern, the United States climate change envoy under President Barack Obama. “Five minutes’ worth of education would tell you that what matters are global averages, and those are going implacably up.”
Politicians have tried to use cold snaps to prove a point before. Mr. Trump’s line of reasoning recalled a February day in 2015 when Senator James Inhofe, Republican of Oklahoma, brought a snowball to the Senate floor as evidence that the Earth was not warming.
The president’s tweet also took an implicit swipe at the Paris climate accord, which Mr. Trump has vowed to abandon. In announcing that the United States would withdraw from the agreement among almost 200 nations to collectively rein in greenhouse-gas emissions, Mr. Trump lobbed a similar charge that the deal put a burden only on America.
The United States under Mr. Obama pledged $3 billion over four years to the Green Climate Fund, aimed at helping countries build resilience to extreme weather and develop clean energy. Japan has paid about $1.5 billion into the fund, Britain $1.2 billion and France and Germany about $1 billion each. Developing countries like Mexico, Chile and Indonesia also have contributed.
Mr. Trump, who once called climate change a hoax perpetuated by the Chinese, has recognized its threats where some of his properties are involved. Last week a council in Ireland gave a golf resort owned by the president approval to build two sea walls. An early application for the construction cited the threat of global warming.
Mr. Trump has made a habit of airing his climate skepticism on Twitter, posting comments on “climate change” or “global warming” more than 100 times since 2011. Thursday’s tweet appeared to be the first time he addressed the issue head-on since becoming president, however. The last time he fired off a tweet on global warming was more than two years ago, when he declared:
The climate may be changing, but some jokes stay the same.
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