scientists say if that continues, the beaches that surround the national park will disappear, the freshwater environments will be changed and will be overrun by saltwater. this is an area that brings millions from around the world and will have an economicesque, the argument goes. there's also a concern broadly around this area in south florida, in this area specifically from palm beach ft. lauderdale, miami, down to the keys rising sea levels have already caused flooding and there's concerns homes could be lost, roads, the economic engine of south florida would be deeply affected by this. so the president is coming here to make points about climate change affecting the economy national security, the global economy and all of that. but it's also not lost on political observers he's coming to florida, where the president governor, to say the least has not exactly embraced the theories of climate change and two of the republican hopefuls jeb bush and marco rubio are from here. it's an educational tour, but also throwing down the gauntlet