crabs that sustain the people now is killing us. >> reporter: every hour of every day a piece of louisiana about the size of a football field slips into the sea, every hour every day. it started when america tamed, locked choking off the natural flow of mud that built this land. these days as it sinks, polar ice melts. seas rise, big storms just keep coming. >> there has been a lot of change in just the last five years. >> reporter: those who studied the drowning of louisiana say it is happening faster than anyone ever predicted. >> maybe five years ago was the first case scenario is now what we might call a fairly likely scenario. >> that's terrifying. >> it is terrifying. it basically means that climate