Conservation groups have sued the government to force federal officials to undertake the first broad environmental review of the government's coal-leasing program in decades.
Friends of the Earth and the Western Organization of Resource Councils filed the lawsuit Tuesday in U.S. District Court in Washington, D.C.
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It's being paid for by the philanthropic foundation of Microsoft founder Paul Allen.
Supporters of the lawsuit said there hasn't been a comprehensive review of the government's coal program since 1979. That's before climate-changing gases produced by burning coal emerged as a significant public concern.
The U.S. Bureau of Land Management has been reviewing its coal-leasing program since a government investigation last year revealed officials accepted below-market bids in some coal sales.
BLM spokesman Jeff Krauss declined to comment on Tuesday's lawsuit.