President Donald Trump was panned on Monday for his dismissal of his own administration’s recently released climate assessment.

Speaking to reporters outside the White House, Trump said of the National Climate Assessment (NCA4), “I’ve seen it, I’ve read some of it, and it’s fine.” Asked about the report’s conclusions on the climate crisis’s economic impact on the country, Trump declared, “I don’t believe it.”

“We cannot afford a leader who sticks his head in the sand while people suffer the consequences,” said Michael Brune, executive director of the Sierra Club.

“The climate assessment, put forth by Donald Trump’s own administration,” Brune added, “makes it clearer than ever that if we don’t act now, the catastrophic effects of climate change will reshape the United States and the world to the detriment of those alive today, and for generations to come.”

Sen. Bernie Sanders (I-Vt.), for his part, said on Twitter the comment made the president “an international embarrassment and incredibly dangerous”:

“Given what we know about the president’s reading habits, I wonder if the report has any pictures,” said Ken Cook, president of the Environmental Working Group, in response to Trump claiming he “read some of” the government’s assessment.

“By now it’s the safest bet in town that when President Trump doesn’t believe something is true, it is,” said Cook. “None of the president’s policy positions are grounded in facts, and his unfortunate decision to dismiss his own government’s alarming study further demonstrates his utter ignorance when it comes to the threats climate change presents to every American.”

Meteorologist Eric Holthaus weighed in on social media as well, calling “the willful denial and obfuscation by Trump on climate change… a crime against humanity”:

Another lawmaker commenting on Trump’s denial was Rep. Pramila Jayapal:

“We have the moral responsibility to #ActOnClimate, NOT bury our heads in the sand,” tweeted the March for Science in response to Trump’s comments:

Some observers had already expressed outrage even before the 1,500-page report was released, saying the timing of the release—the Friday following Thanksgiving—was a ploy by the adminstration to limit news covereage of it.

Following its release, Brenda Ekwurzel, the director of climate science at the Union of Concerned Scientists and one of the NCA4 report authors, said, “In light of the report’s findings, it’s critical that federal, state, and local governments take aggressive action to protect U.S. residents by both reining in emissions and helping communities adapt to the climate impacts that are now inevitable.”

“While the report doesn’t offer policy recommendations,” she continued, “the findings certainly make a convincing case that the White House should stop rolling back climate policies and recognize that a much larger scale response is required to keep people safe.”

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