Megastorms: Some experts suggest it is time to add a Category 6 to the Saffir-Simpson Hurricane Wind Scale, following recent hurricanes in Florida and Texas. 7+. (1 of 10)
Megastorms: Some experts suggest it is time to add a Category 6 to the Saffir-Simpson Hurricane Wind Scale, following recent hurricanes in Florida and Texas. 7+. (1 of 10)
Heat: As global warming heads to 2 degrees Celsius, heat waves are on the rise, with droughts, fires and floods. 7+