Well, that is certainly hotly debated.

This morning, I read a New York Times article on hurricanes and global warming ("Will warming lead to a rise in hurricanes?"). It began:

"When people worry about the effects of global warming, they worry more about hurricanes than anything else. In surveys, almost three-quarters of Americans say there will be more and stronger hurricanes in a warming world. By contrast, fewer than one-quarter worry about increased coastal flooding.

But as far as the scientific consensus is concerned, people have things just about backward.

There is no doubt that as the world warms, seas will rise, increasing the flood risk, simply because warmer water occupies more space. (And if the Greenland or Antarctic ice sheets melt, the rise will be far greater.)

It seems similarly logical that as the world warms, hurricanes will be more frequent or more powerful or both. After all, they draw their strength from warm ocean waters. But while many scientists hold this view, there is far less consensus, in part because of new findings on other factors that may work against stronger, more frequent storms."

If you're interested in the debate about whether or not global warming is affecting the frequency and severity of tropical storms, give it a read.