(John Roark | The Idaho Post-Register via AP, file) In this June 11, 2020 file photo Wynn Whitmeyer of the Idaho Falls Fire Department uses a drip can to ignite cheat grass and tumbleweeds during a controlled burn east of Idaho Falls, Idaho. Environmentalists have filed a notice of intent to sue the U.S government to block plans to build up to 11,000 miles of fuel breaks they claim would violate the Endangered Species Act in a misguided effort to slow the advance of wildfires in six Western states.