National Geographic: Hours after a powerful tornado tore through an Oklahoma suburb, killing dozens, some renewed speculation about such storms connection to climate change. In recent years, researchers have been working to assess what causes these storms and whether manmade global warming could be affecting them.
Plain geography is a factor. Moore, Oklahoma, is in the middle of what is known as Tornado Alley--an area where cold, dry air from Canada and the Rockies meets warm, moist air from the Gulf of Mexico to...