Off-road vehicle enthusiasts are suing the U.S. Forest Service over sage grouse in Nevada and California. They’re arguing that a protection plan enacted this year could increase fire danger across rangeland habitat of a bird already proposed for threatened status. The California Four Wheel Drive Association and off-road groups in the Sierra and Nevada’s Pine Nut Mountains say the protection measures in the Humboldt-Toiyabe National Forest weren’t included among the alternatives subjected to scientific scrutiny and public comment as required by federal environmental laws. The lawsuit was filed in U.S. District Court in Reno.