Ex-NASA Scientist James Hansen: There is a Clear Link Between Climate Change & Stronger Hurricanes

Dr. James Hansen has been called the "father of climate change awareness." In 1988, Hansen first warned about the dangers of global warming when he testified before Congress. At the time, he was the top climate scientist at NASA, where he headed the Goddard Institute for Space Studies. We speak with world-renowned climatologist Dr. James Hansen on what role climate change played in unleashing Hurricane Harvey.