ASSOCIATED PRESS The Trump White House is moving to change the methodology of the next National Climate Assessment, downplaying the future threat of climate change, as at least one federal agency has already been ordered to limit its climate models’ projections.

As planet-warming gases reach levels not previously seen in human history, the Trump administration’s bid to restrict how federal scientists conduct the next National Climate Assessment risks delaying urgent action required to curb emissions and climate change. But the administration effort could also backfire, becoming yet another loss for a president whose deregulatory efforts struggle to meet basic legal standards while hardening the resolve of career government researchers trying to uphold the scientific method. Last fall, the White House released the second volume of the Fourth National Climate Assessment, a 13-agency analysis of peer-reviewed climate science required by Congress at least every four years. The release cast a shadow over President Donald Trump’s historic assault on environmental regulations and buttressed the United Nations’ dire and widely reported warnings released a month earlier. The National Climate Assessment projected disease, death and destruction due to extreme weather, sea level rise and disruptions to ecological systems. It was no surprise when the Trump administration published the report on Black Friday, the shopping bonanza following Thanksgiving, in what many interpreted as a cynical ploy to bury the report. Now environmental advocates are questioning officials’ suggestion that the White House might change the methodology of the next report in response to scrutiny the administration didn’t expect to receive over the last one. Admitting he hadn’t yet read the full assessment, Andrew Wheeler, then the acting administrator of the Environmental Protection Agency, accused the 300 scientists who authored the National Climate Assessment of political bias and vowed to “take a look at the modeling” to ensure “more realistic projections.”

The people doing everything they can to keep us in a high-emissions scenario don’t want us to analyze the ramifications of being in a high-emissions scenario. Susan Joy Hassol, senior science writer on the first three National Climate Assessments

That effort appears to be making headway, according to a report published Sunday in The New York Times. The U.S. Geological Survey’s newly appointed director, James Reilly, a former astronaut and oil geologist, ordered the agency to limit its climate models’ projections to just 21 years out. That’s meant to set the stage for similar changes to the next National Climate Assessment, which is in its early stages and could be released as soon as 2021. Myron Ebell, the climate change denier at the right-wing Competitive Enterprise Institute think tank who led Trump’s EPA transition team in 2017, suggested the National Climate Assessment could exclude “worst-case scenario” projections that calculate how much destruction the current rate of warming will wreak. Keeping the National Climate Assessment from projecting beyond 2040 would violate the Global Change Research Act of 1990, which explicitly requires a report that “analyzes current trends in global change, both human-induced and natural, and projects major trends for the subsequent 25 to 100 years.” “Any effort to limit climate projections to the year 2040 would be plainly illegal,” said Michael Gerrard, the director at Columbia University’s Sabin Center for Climate Change Law.

The Washington Post via Getty Images Flooding from extreme weather in Davenport, Iowa.

It’s “particularly ironic” that the Trump administration suggests that “worst-case scenario” forecasts, in which emissions continue increasing relatively unabated, are unrealistic, said Susan Joy Hassol, the former senior science writer on the National Climate Assessments that came out in 2000, 2009 and 2014. “The people doing everything they can to keep us in a high-emissions scenario don’t want us to analyze the ramifications of being in a high-emissions scenario,” said Hassol, now the director of the North Carolina-based nonprofit Climate Communication. Politicizing the report isn’t a new tactic. In 2000, the incoming George W. Bush administration tried to bury the first National Climate Assessment after scientists had already completed the report. The administration then delayed the second National Climate Assessment and tried to censor entire sections. The ensuing legal battle ended up delaying the release of the report until 2009. “There was interference, but nobody ever said, ‘You can’t use a high-emissions scenario,’ ‘You can’t use a business-as-usual scenario’ or ‘You can’t look out a century,’” she said. “That’s just not the way science is done. It’s crazy.” Climate policy was an abstract concept largely limited to the federal sphere 15 years ago, but today, state and local officials are scrambling to enact regulations and laws to adapt to a hotter world and reduce emissions. If the National Climate Assessment, which includes detailed regional projections, becomes less credible, that would be a loss for those policymakers, said Bob Kopp, a climate scientist and policy scholar at Rutgers University. “It’s valuable at a state and local level, areas that don’t have the resources to do that sort of work on their own,” Kopp said. “California has a pretty intensive climate assessment, but not every state does.” The White House did not respond to HuffPost’s emailed questions about changes to the next climate assessment. EPA spokesman James Hewitt defended changing “inaccurate modeling that focuses on worst-case emissions scenarios,” and that “does not reflect real-world conditions,” as a general point, but told HuffPost “there are currently no specific efforts underway at EPA” regarding the National Climate Assessment. The National Oceanic and Atmospheric Administration, the lead agency on the National Climate Assessment, did not respond to HuffPost’s request for comment but told the Times, “No changes are being considered at this time.” Asked about potential changes to the methodology, Interior Department spokeswoman Molly Block said of the Times story: “The information in that article is incorrect.” Thee Trump administration’s push comes as climate change is finally becoming a top concern for voters across the developed world. In March, a Gallup poll found that 81% of self-described liberals, 77% of Democrats and 53% of independents reported feeling “highly worried” about climate change. In April, a CNN poll pegged climate change as a top issue for 82% of registered Democrats planning to vote in the 2020 presidential primary. In Europe, Spain’s Socialist Party won reelection last month with a Green New Deal as its platform issue. And Green parties surged in last weekend’s European Parliament elections.

That’s just not the way science is done. It’s crazy. Susan Joy Hassol, senior science writer on the first three National Climate Assessments