(August 1, 2017, 1:36 PM EDT) -- SAN FRANCISCO — The Sierra Club and other environmental advocacy groups on July 27 filed a brief in California federal court contending that Secretary of the Interior Ryan Zinke exceeded his authority when he delayed implementation of a rule aimed at reducing methane waste connected to hydraulic fracturing operations (Sierra Club, et al. v. Ryan Zinke, et al., No. 17-3885, N.D. Calif.)....