The damning report, known as the National Climate Assessment, says that the consequences of climate change will leave no part of the USA untouched and that the warming climate will increase wildfires, crumble infrastructure, worsen air quality, destroy crops and lead to more frequent disease outbreaks.
'I've seen it, I've read some of it, and it's fine, ' he added.
The fifth installment would be due during President Trump's second term if he's re-elected.
The study, the Fourth National Climate Assessment, was compiled by 13 federal agencies and more than 300 leading climate scientists.
"I don't believe it", he told reporters on Monday. In that time, the administration deleted federal webpages on climate science, proposed dramatic cuts to federal climate research and rolled back a number of regulations meant to reduce greenhouse gas emissions.
What did the report say? Right now we're at the cleanest we've ever been. "What WH says is demonstrably false".
A White House spokeswoman noted that, since 2005, carbon dioxide emissions related to energy production in the United States have dropped 14 percent.
USA carbon emissions from industry slipped 2.7 per cent a year ago as coal plants shut and use of natural gas and renewable energy rose.
The National Climate Assessment was written long before the California fires and the hurricanes. "Publishing a dire climate report in the final hours of Black Friday might be the biggest Friday news dump of them all", The Atlantic reports.
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"Any change in the climate poses a major challenge to agriculture through increased rates of crop failure, reduced livestock productivity and altered rates of pressure from pests, weeds and diseases", according to the report's chapter on agriculture. Where the hell is GLOBAL WARMING???
The President's views on man-made climate change has been rather consistent prior to and throughout his tenure.
The report disputes those notions.
How can @realDonaldTrump still think climate change is a "hoax"?
"But asked about the study's conclusion that climate change would devastate the United States and world economy if left unchecked, he declared: "I don't believe it."'I don't believe it" as he left the White House for campaign stops in Mississippi.
The Associated Press and VOA News reported this story. It could be warming and it's going to start to cool at some point... In the US, tree canopy increased by 15%.
On "Meet the Press", Sen. "It addresses our country", he said. In fact, Trump's 2016 presidential campaign pledge of reviving the country's coal industry is gaining momentum. "And innovation can be choked out through excessive government regulation". Notably, the scientists behind the report wrote that the effects of climate change "are already being felt in communities across the country".
But it says that projections of future catastrophe could change if society works to reduce greenhouse gas emissions and "to adapt to the changes that will occur". I believe there's change, and I believe it goes up and it goes down, and it goes up again'.
Incoming Democratic Rep. Alexandria Ocasio-Cortez of NY used the report to continue pushing her colleagues to take a more aggressive stance on climate policy.
The study also dives into what is causing all this climate change - us. We need bold action, not denials.