Drought that stretched across three continents this summer — drying out large parts of Europe, the United States and China — was made 20 times more likely by climate change, according to a new study. Researchers from World Weather Attribution, a group of scientists from around the world who study the link between extreme weather and climate change, say this type of drought would only happen once every 400 years across the Northern Hemisphere if not for human-caused climate change. Now they expect these conditions to repeat every 20 years, given how much the climate has warmed. To figure out...