Want climate news in your inbox? Sign up here for Climate Fwd:, our email newsletter.

WASHINGTON — The Trump White House, which has defined itself by a willingness to dismiss scientific findings and propose its own facts, on Friday issued a scientific report that directly contradicts its own climate-change policies.

That sets the stage for a remarkable split-screen political reality in coming years. The administration is widely expected to discount or ignore the report’s detailed findings of the economic strain caused by climate change, even as it continues to cut environmental regulations, while opponents use it to mount legal attacks against the very administration that issued the report.

“This report will be used in court in significant ways,” said Richard L. Revesz, an expert in environmental law at New York University. “I can imagine a lawyer for the Trump administration being asked by a federal judge, ‘How can the federal government acknowledge the seriousness of the problem, and then set aside the rules that protect the American people from the problem?’ And they might squirm around coming up with an answer.”

The 1,656-page National Climate Assessment, which is required by Congress, is the most comprehensive scientific study to date detailing the effects of global warming on the United States economy, public health, coastlines and infrastructure. It describes in precise detail how the warming planet will wreak hundreds of billions of dollars of damage in coming decades.