The personal fortunes of just 782 of the world’s wealthiest people could power half the world—Africa, Latin America, and “most of Asia”—with 100 percent renewable energy within 15 years, according to a new report to be published Monday. Broken down by continent, it would take the wealth of just 53 rich people to power all of Africa, and a mere 32 prosperous people could plug in the vast majority of Latin America.