viinia bea, miami, new orleans, they're already dealing with those types of impact. one trillion dollars worth of structures and property sitting right at the shoreline. so flooding will get more extensive, it will happen more frequent, and th sort of thi is whatuts millns of americans at risk every year. >> by 2045, we could see as little as 5 inches of extra sea level rise or 11 inches of extra sea level rise. now, to put that in concrete terms, let's look at the u.s. naval academy in annapolis, maryland. now, annapolis right now experiences about 50 nuisance floods a year. unr the best- case scenario, in 30 years hence it could be as high as over 240, about, high tides a year. if we have a highest-emission scenario, it could be as high as 380 tides a year, many of those twice a day. we think, there's only 365 days in the year. pretty much, that's almost... you know, it's inundation at that point. >> and in this country, we have encouraged people to build on coastal areas, barrier islands, and other high-risk areas that inevitably raise the risk level and the expos