New Scientist: If climate change was a game, we'd have racked up quite a score. A fresh study suggests that humans are responsible for a hefty number of today's extreme hot days and rainstorms. Weather extremes, such as a Russian heatwave in 2010 and a drought in Texas in 2011, have been blamed on climate change before but the attribution of individual events to it is still hotly debated. So Erich Fischer and Reto Knutti at the Institute for Atmospheric and Climate Science in Zurich, Switzerland, took a bird's-eye...