Reuters: The head of the U.S. Environmental Protection Agency lied to Congress about his rejection of a request from California meant to curb global warming emissions, Sen. Barbara Boxer said on Tuesday. Boxer, a California Democrat who has called for EPA chief Stephen Johnson to resign, made the statement at a hearing on regulation of greenhouse gases under the U.S. Clean Air Act. “You’ve shown that what Mr. Johnson told us is not the truth,” Boxer told Sen. Sheldon Whitehouse, a Rhode …