Why climate change means new risk for U.S. financial markets

From fires to floods, the warming climate is reshaping the globe. In fact, the decade of the 2010s was the hottest ever recorded on Earth. And although activists and scientists have long been sounding the alarm, a new voice joined the chorus recently: investment firm BlackRock. William Brangham talks to BlackRock’s Brian Deese about how climate change is altering American business and finance.