Outlining the urgent risks of global warming for U.S.

Aired: 5/6/2014 | 0:10:16 | Clip
In its most comprehensive report on climate change yet, the White House forecasts the likely negative effects facing each of the eight regions in the U.S., from drought in the Southwest, to stronger storms in the Northeast. The administration is expected to cite the warnings when it lays out new regulations this summer. John Holdren, science advisor to the president, talks to Gwen Ifill.