German Chancellor Angela Merkel used her closing speech at the recent Group of 20 summit to chide President Trump for withdrawing the U.S. from the Paris climate accord. Yet the German people will benefit far more from the American president’s focus on facilitating U.S. energy production and boosting exports than from Mrs. Merkel’s climate policies. They have increased residential electricity prices for German households and failed to achieve any meaningful reductions in fossil-fuel consumption or carbon-dioxide emissions. …