By Lawrence Hurley and Valerie Volcovici WASHINGTON (Reuters) -The U.S. Supreme Court on Thursday imposed limits on the federal government’s authority to issue sweeping regulations to reduce carbon emissions from power plants in a ruling that will undermine President Joe Biden’s plans to tackle climate change and could constrain various agencies on other issues. The court’s 6-3 ruling restricted the Environmental Protection Agency’s (EPA) authority to regulate greenhouse gas emissions from existing coal- and gas-fired power plants under the landmark Clean Air Act anti-pollution law. Biden’s ad…