http://news.nationalgeographic.com/news/2013/03/130319-hurricane-climate-change-katrina-science-global-warming/?rptregcta=reg_free_np&rptregcampaign=20131016_rw_membership_r1p_us_se_w#close-modalRising Temperatures May Cause More Katrinas
Past hurricanes have supported the study's finding that global temperature rise is linked to more destructive storms. According to the National Center for Atmospheric Research,
while the frequency of storms doesn't appear to have increased, the percentage of strong ones has risen sharply over the past few decades.