The Sierra Club sued the Environmental Protection Agency (EPA) on Wednesday after the agency refused to turn over any documents to back up Administrator Andrew Wheeler Andrew WheelerOvernight Energy: Trump officials finalize plan to open up protected areas of Tongass to logging | Feds say offshore testing for oil can proceed despite drilling moratorium | Dems question EPA's postponement of inequality training Democrats question EPA postponement of environmental inequality training OVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right MORE’s claim that climate change “is 50 to 75 years out.”

The Sierra Club had filed a Freedom of Information Act (FOIA) request in April asking the EPA to provide all records Wheeler relied on in making that statement, as well as any research from the EPA that supported his claim.

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Wheeler’s comments came in an April interview with CBS News, when he said he would be focused on pressing issues like access to clean water since “most of the threats from climate change are 50 to 75 years out.”

The EPA denied the Sierra Club's FOIA request in June, saying the request “fails to adequately describe the records sought.”

“Your request does not seek specific records but is rather a question framed as a FOlA request,” the agency wrote in a letter to the Sierra Club.

The environmental group then appealed through the FOIA process but never heard back from EPA. The Sierra Club then filed a lawsuit Wednesday in the D.C. District Court.

“They’re essentially arguing that the public does not have a right to know what, if anything, is supporting his claims,” said Matthew Miller, an attorney for the Sierra Club.

“The EPA either needs to admit there is in fact no support for the administrator’s statement and they need to set the record straight that he was misleading and inaccurate,” Miller said. “Or they need to provide us with whatever unknown basis of support they are relying on — which is apparently none — and which would be contrary to the overwhelming scientific consensus and his own agency’s scientists' research.”

An EPA spokesman said in an email Thursday that while the agency would not comment on pending litigation, "experts from EPA and other organizations like the [United Nation's Intergovernmental Panel on Climate Change] regularly measure climate change impacts, including the effects of regulation, in multi-decadal time frames, not year-to-year variations."

Wheeler’s April statement contradicted numerous government reports which call for a sense of urgency in battling climate change.

Almost all climate scientists have concluded that the effects of human-caused climate change are already taking place.

The FOIA process has previously been used by environmental groups to challenge EPA statements about climate change.

In August 2018, a suit forced the EPA to acknowledge that now-former Administrator Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention MORE failed to back up his reasoning with science when he claimed humans are not the central cause of climate change.

Pruitt told CNBC’s “Squawk Box" in 2017 that humans were not a "primary contributor to the global warming that we see."

Public Employees for Environmental Responsibility filed a FOIA request, and after a lawsuit secured Pruitt’s preparation notes, none of which referenced climate change.