Recent research in this area suggests that there has been an increase in intense hurricane activity over the past 40 years. (ucsusa.org)
Some point to periods of intense hurricane activity in Earth's past and worry that such trends may return. (science.howstuffworks.com)
The prehistoric sediments showed that there were two periods of elevated intense hurricane activity on Cape Cod — from 150 to 1150 and 1400 to 1675. (kaltesonne.de)