Study Finds Large Increase in Strong Hurricanes

The number of Category 4 and 5 hurricanes has increased by 80 percent worldwide during the past 35 years、according to a study in the 16 September 2005 issue of Science (vol. 309、pp. 1844-1846). Hurricanes in these two highest storm categories、with winds of 135 miles per hour or greater、now account for roughly 35 percent of all hurricanes、up from around 20 percent in the 1970s.

資料來源：U.S. EPA、2005