A new report claims policies to keep future global warming to internationally agreed upon limits by the end of the century could make the world $19 trillion richer. The report by the International Renewable Energy Agency (IRENA) was one of two commissioned by the German government to help convince President Donald Trump to stay in the Paris agreement. If IRENA’s top-line findings sound too good to be true, that’s because they might be. The world would have to put $145 trillion into low-carbon energy to become $19 trillion richer by 2050 — a 13 percent return on investment over 33...