(Job One Editor's note: I respectfully disagree with the above statement. Read this story... MORE STORMS EXPECTED DUE TO GLOBAL WARMING, SCIENTISTS SAY...)
It is not the frequency but the intensity of hurricanes that is affected. Tropical storms spin off of places like the Sahara like a series of bowling balls, and it is when they pass over warm ocean waters that they gain sufficient energy to ramp up into hurricanes. The greater the amount of energy gained, the higher the number attached to the hurricane.
A 5-degree Celsius (9-degree Fahrenheit) sea water surface temperature will increase its vapor pressure about one-third (which affects the rate of evaporation). In addition, there are effects from winds whipping up spray.
Scientific opinions are not just opinions, not when based on scientific evidence obtained without prejudice.
— Richard L. Handy, Madrid, professor emeritus, Iowa State University