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White House Press Secretary Sarah Sanders during a press briefing. Photo: Chip Somodevilla/Getty Images

White House press secretary Sarah Sanders criticized the new climate report that the Trump administration published on Black Friday, saying its conclusions were "based on the most extreme model scenario" and were not based on "facts."

The big picture: The report, known as the Fourth National Climate Assessment, warns that the U.S. will suffer increasingly deadly and costly climate change impacts if greenhouse gas emissions are not sharply reduced in the next decade and more aggressive actions are not taken to adapt to extreme weather events and other climate impacts.

Background: On Monday, President Donald Trump told reporters he did not believe the report's conclusions, even though the findings were the product of work overseen by scientists and officials in his own administration.

"We think this is the most extreme version, and it's not based on facts. It's not data driven. We'd like to see something that is more data driven. It's based on modeling, which is extremely hard to do when you're talking about the climate."
— Press Secretary Sarah Sanders

Reality check: The report does include observational data, everything from the amount of carbon dioxide in the air to the melting rate of Greenland's ice cap, along with cutting-edge computer model scenarios that simulate how climate change may play out.

  • Scientists who wrote the report have been pushing back at arguments by the White House and others, who have said that it's alarmist in its conclusions.

The report underwent extensive peer review and incorporated feedback from the public, in the form of about 10,000 comments.

Go deeper:

Go deeper

Updated 1 hour ago - Politics & Policy

In photos: The Biden and Harris inauguration

President Biden and first lady Jill Biden watch a fireworks show on the National Mall from the Truman Balcony at the White House on Wednesday night. Photo: Chip Somodevilla/Getty Images

President Biden signed his first executive orders into law from the Oval Office on Wednesday evening after walking in a brief inaugural parade to the White House with First Lady Jill Biden and members of their family. He was inaugurated with Vice President Kamala Harris at the U.S. Capitol on Wednesday morning.

Why it matters: Many of Biden's day one actions immediately reverse key Trump administration policies, including rejoining the Paris Agreement and the World Health Organization, launching a racial equity initiative and reversing the Muslim travel ban.

Republicans pledge to set aside differences and work with Biden

President Biden speaks to Sen. Mitch McConnell after being sworn in at the West Front of the U.S. Capitol on Wednesday. Photo: Erin Schaff-Pool/Getty Images

Several Republicans praised President Biden's calls for unity during his inaugural address on Wednesday and pledged to work together for the benefit of the American people.

Why it matters: The Democrats only have a slim majority in the Senate and Biden will likely need to work with the GOP to pass his legislative agenda.

The Biden protection plan

Joe Biden announces his first run for the presidency in June 1987. Photo: Howard L. Sachs/CNP/Getty Images

The Joe Biden who became the 46th president on Wednesday isn't the same blabbermouth who failed in 1988 and 2008.

Why it matters: Biden now heeds guidance about staying on task with speeches and no longer worries a gaffe or two will cost him an election. His staff also limits the places where he speaks freely and off the cuff. This Biden protective bubble will only tighten in the months ahead, aides tell Axios.