Now that Japan's nuclear crisis level has risen to 7, the highest rating possible, media outlets around the world have been quick to compare the ongoing emergency at Fukushima with the disaster that struck Chernobyl in April 1986.
Up until this point, Chernobyl was the only disaster to be labeled a 7, which entails a “major release of radioactive material with widespread health and environmental effects," according to International Nuclear and Radiological Event Scale (INES).