Donald Trump said Monday he not does not agree with the findings of a new report produced by his administration that warns that climate change could cost the economy hundreds of billions of dollars by 2100 if no changes are made.

“I don’t believe it,” Trump told reporters when asked about the report’s findings, which were released Friday.

Trump then babbled, “You’re going to have to China and Japan and all of Asia and all of these other countries, you know, it addresses our country. Right now we’re the cleanest we’ve ever been, and that’s very important to me, but if we’re clean, but every other place on Earth is dirty, that’s not so good. So I want clean air, I want clean water, very important.”

The National Climate Assessment, prepared by 13 federal agencies and required by Congress, says if no major climate change policy happens soon, the damage of global warming will cut 10 percent off the size of the American economy by century’s end.

The report found that no sector of the economy will be unaffected, projecting in a worst-case scenario that labor-related losses caused by extreme heat could total $155 billion annually by 2090, while coastal property damage from sea level rise could reach $118 billion.

“The evidence of human-caused climate change is overwhelming and continues to strengthen, the impacts of climate change are intensifying across the country, and climate-related threats to Americans’ physical, social, and economic well-being are rising,” the report said.

Climate change is already having an economic impact today, affecting U.S. companies’ overseas business operations and supply chains, the report says, and could disrupt global trade. The White House has downplayed the report, which began before climate skeptic Trump took office, saying it was “largely based on the most extreme scenario.”

WATCH:

Trump dismisses govt report about dire economic consequences of climate change: "I don't believe it. And here's other thing, you're going to have to China & Japan & all of Asia & all of these other countries — you know, it addresses our country. Right now we're the cleanest." pic.twitter.com/8vCeHepvGM

— Aaron Rupar (@atrupar) November 26, 2018