This setback is the latest in what environmental law observers estimate is a string of about 40 such courtroom losses for efforts by Mr. Trump to undo Mr. Obama’s environmental rules.
On Friday, the United States Court of Appeals for the Ninth Circuit gave the Environmental Protection Agency 90 days to decide whether it will ban chlorpyrifos, a pesticide linked to brain damage. While the Obama administration had recommended banning the chemical, based on the recommendations of E.P.A. scientists, the Trump administration has sought to allow the agriculture industry to continue to use the chemical.
And last month a federal judge in Alaska ruled unlawful an executive order by Mr. Trump that lifted an Obama-era ban on oil and gas drilling in the Arctic Ocean and parts of the North Atlantic coast.
Fossil fuel advocates, however, have taken heart in the recent confirmation of Secretary of Interior David Bernhardt, an expert in natural resources law who previously worked as an oil lobbyist.
Mr. Bernhardt’s predecessor, Mr. Zinke, a former congressman and member of the Navy SEALs, was viewed as inexperienced with policy and legal matters. Mr. Bernhardt is known as a deeply experienced legal and policy expert, who as a lawyer argued major environmental and energy cases before federal courts.
“Bernhardt is a whole different thing,” said Patrick Parenteau, a professor of environmental law at Vermont Law School. “They’ve been in such a hurry to carry out orders and they’ve been cutting corners — they’ll probably clean that up.”
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