Sea level rise is a reality being modeled by scientists and faced head on in many cities and communities now struggling to defend themselves against these changes - and adapt to them. New research published last week in the journal Nature Communications shows that rising seas could affect three times as many people by 2050 than previously thought, threatening to erase some of the world's great coastal cities. Benjamin Strauss, the Chief Executive for the research group Climate Central, joined Chris and Nell in the first part of the show to discuss his research.