Floods spurred by rising seas threaten 5 million

For the nearly 5 million people who live along the U.S. coasts from Maine to the Gulf of Mexico and the West Coast, rising seas fueled by global warming have doubled the risk of so-called once-a-century floods, according to a trio of environmental reports released on Wednesday. These new reports - one from the non-profit group Climate Central and two others published in the peer-reviewed journal Environmental Research Letters - offer a detailed picture of where the most severe risks are along coastlines of the contiguous 48 states.