Removing the endangerment finding undercuts the statutory trigger the EPA has used to regulate greenhouse-gas emissions under the Clean Air Act, weakening the legal foundation for existing and future federal climate rules. Regulated sectors (power, oil and gas, autos, heavy industry) should expect compliance planning to shift from federal rulemaking toward litigation, state-level requirements, and voluntary standards. Companies with decarbonization investments tied to anticipated federal tightening may need to re-sequence capex and procurement timelines, while fossil-fuel producers gain near-term operating flexibility pending court challenges.