CBS: A report Friday by U.S. government scientists said 2014 was earth's warmest year on record.
In Miami Beach, ocean water often floods downtown streets. Sea levels are rising at an alarming rate. In south Florida, they're expected to rise five to seven inches in the next 30 years due to global warming.
Play Video U.S. Sanders: Hard to do serious things if you deny science
Sen. Bernie Sanders is making climate change a key issue with an amendment...