the united nationspfip level sea levels are rising faster than predicted. >> today's flood going to be tides. and so we need to get ready for changes, a deeper bay. a bay with bigger waves and more7?s8$ frequent flooding. >> the bay conservation and development commission is in charge of making these maps showing areas in danger of flooding. but now, maybe sooner with models of the un report that now account for melting perma froth. >> san francisco water front will be the last parts of the bay shore to flood. regulators caution if walls aren't built along the bay area shore line, communities can line up underwater. >> communities like foster city. nearly all of it in danger of being underwater. >> therey$bh is going to be a lt of people displaced. it's expensive down here. >> if you think rain cancelsaaté flights now, the san francisco and oakland airports could be shutting down flooded runways. >> that is crazy. that would be shocking if that were to happen. planners say engineering projects not to be taken lightly. >> we should take time to do it right. but we probably need to move