Scientists have expressed confidence that climate change will make hurricanes more intense, as well; the unusually strong hurricanes that have formed over the past few years give evidence for this. "We are confident not just because models predict hurricane intensification, but because we understand the reasons why they do and can explain those reasons in terms of what we know about how hurricanes work today," said atmospheric scientist Adam Sobel, author of "Storm Surge: Hurricane Sandy, Our Changing Climate, and Extreme Weather of the Past and Future" (HarperWave, 2014).