The congressionally mandated report by 13 federal agencies, the first of its kind under the Trump administration, found that climate change is already being felt in communities across the United States.
Unchecked climate change will cost the U.S. hundreds of billions of dollars and damage human health and quality of life, a USA government report warns.
The government's next update of the National Climate Assessment, she said, "gives us the opportunity to provide for a more transparent and data-driven process that includes fuller information on the range of potential scenarios and outcomes". It warns of more, stronger, and longer disasters triggered at least in part by global warming.
Report co-author Katharine Hayhoe, of Texas Tech University, said "we are seeing the things we said would be happening, happen now in real life".
Climate change will cost the U.S. economy hundreds of billions of dollars by the end of the century, hitting everything from health to infrastructure, according to a government report issued on Friday that the White House called inaccurate.
The federal report says the last few years have smashed records for damaging weather in the United States, costing almost $US400 billion (NZ$589 billion) since 2015.
The report, the Fourth National Climate Assessment Volume II, supplements a study issued previous year that concluded humans are the main cause of global warming, and warned of potentially catastrophic effects to the planet. President Trump has been vocal in his skepticism about man-made climate change and the effects it is allegedly having both on temperatures and extreme weather events.
And Donald Wuebbles, a co-author from University of IL climate scientist, said, "We're going to continue to see severe weather events get stronger and more intense".
The air pollution from wildfires combined with heat waves is a major future health risk for the west, the report says.
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It said global warming would disproportionately hurt the poor, broadly undermine human health, damage infrastructure, limit the availability of water, alter coastlines, and boost costs in industries from farming to energy production.
The report said climate change was "presenting growing challenges to human health and safety, quality of life, and the rate of economic growth".
"With continued growth in emissions at historic rates, annual losses in some economic sectors are projected to reach hundreds of billions of dollars by the end of the century - more than the current gross domestic product (GDP) of many USA states", the report said.
At the time, Mr Trump said he wanted to negotiate a new "fair" deal that would not disadvantage U.S. businesses and workers.
"Future risks from climate change depend primarily on decisions made today", it says.
Earlier this week, the United States president appeared to deride the idea of climate change in a tweet about the weather.
Trump tweeted this week about the cold weather hitting the East including: "Brutal and Extended Cold Blast could shatter ALL RECORDS - Whatever happened to Global Warming?"
During a press conference Friday, officials behind the report repeatedly declined to answer questions about the timing of its release and why it contradicts public statements from Trump.
After taking office he announced the U.S. would withdraw from the Paris climate change agreement, which commits another 187 other countries to keeping rising global temperatures "well below" 2C above pre-industrial levels.