(April 8, 2021, 11:17 AM EDT) -- WASHINGTON, D.C. — The Center for Biological Diversity (CBD) and a host of other environmental advocacy groups on April 6 filed a petition for rulemaking with the U.S. Environmental Protection Agency asking it to remove methane and ethane from the list of compounds that are exempted from the definition of volatile organic compounds (VOCs) in the Code of Federal Regulations....