Watch: NASA's got some bad news on rising sea levels

Oceans around the world are rising dangerously, warns NASA, adding that the ramifications of sea level rise can be even scarier than the worst-case scenarios predicted by climate models. Seas around the world have risen an average of nearly three inches since 1992, with some locations rising more than nine inches due to natural variation, according to the latest satellite measurements from NASA and its partners. And they say that rate is increasing. NASA says sea levels could rise by as much as several feet over the next century. Melting polar ice and the expansion of ocean water due to trapped carbon emissions are to blame. That particularly threatens the world's coastal communities.