Legally mandated US national climate assessments seem to have disappeared from the federal websites built to display them, making it harder for state and local governments and the public to learn what to expect in their back yards from a warming world.

Scientists said the peer-reviewed authoritative reports save money and lives. Websites for the national assessments and the US Global Change Research Program were down Monday and Tuesday with no links, notes or referrals elsewhere. The White House, which was responsible for the assessments, said the information will be housed within Nasa to comply with the law, but gave no further details.

Searches for the assessments on Nasa websites did not turn them up. Nasa did not respond to requests for information. The National Oceanic and Atmospheric Administration, which coordinated the information in the assessments, did not respond to repeated inquiries.

“It’s critical for decision-makers across the country to know what the science in the National Climate Assessment is. That is the most reliable and well-reviewed source of information about climate that exists for the United States,” said Kathy Jacobs, a University of Arizona climate scientist, who coordinated the 2014 version of the report.

“It’s a sad day for the United States if it is true that the National Climate Assessment is no longer available,” Jacobs added. “This is evidence of serious tampering with the facts and with people’s access to information, and it actually may increase the risk of people being harmed by climate-related impacts.”

Harvard climate scientist John Holdren, who was Barack Obama’s science adviser and whose office directed the assessments, said that after the 2014 edition, he visited governors, mayors and other local officials who told him how useful the 841-page report had been. It helped them decide whether to raise roads, build seawalls and even move hospital generators from basements to roofs, he said.

“This is a government resource paid for by the taxpayer to provide the information that really is the primary source of information for any city, state or federal agency who’s trying to prepare for the impacts of a changing climate,” said Texas Tech climate scientist Katharine Hayhoe, who has been a volunteer author for several editions of the report.

Copies of past reports are still squirreled away in Noaa’s library. Nasa’s open science data repository includes dead links to the assessment site.

The most recent report, issued in 2023, includes an interactive atlas that zooms down to the county level. It found that climate change is affecting people’s security, health and livelihoods in every corner of the country in different ways, with minority and Native American communities often disproportionately at risk.

The 1990 Global Change Research Act requires a national climate assessment every four years and directs the president to establish an interagency United States Global Change Research Program. In the spring, the Trump administration told the volunteer authors of the next climate assessment that their services weren’t needed and ended the contract with the private firm that helps coordinate the website and report.

Additionally, Noaa’s main climate.gov website was recently forwarded to a different Noaa website. Social media and blogs at Noaa and Nasa about climate impacts for the general public were cut or eliminated.

“It’s part of a horrifying big picture,” Holdren said. “It’s just an appalling whole demolition of science infrastructure.”

The national assessments are more useful than international climate reports put out by the UN every seven or so years because they are more localized and more detailed, Hayhoe and Jacobs said.

The national reports are not only peer-reviewed by other scientists, but examined for accuracy by the National Academy of Sciences, federal agencies, the staff and the public.

Hiding the reports would be censoring science, Jacobs said.

It’s also dangerous for the country, Hayhoe said, comparing it to steering a car on a curving road by only looking through the rearview mirror: “And now, more than ever, we need to be looking ahead to do everything it takes to make it around that curve safely. It’s like our windshield’s being painted over.”