Heritage’s clone of the Energy Information Administration’s energy model shows that restricting energy production to meet targets like those of the Paris agreement will significantly harm the U.S. economy. Bureaucratically administered mandates, taxes, and special interest subsidies will drive family incomes down by thousands of dollars per year, drive up energy costs, and eliminate hundreds of thousands of jobs. All of these costs would be incurred to achieve only trivial and theoretical impacts on global warming. Policymakers should therefore make every effort possible to prevent implementation of these harmful environmental regulations.