Across Southeast Asia, vast areas of coastal mangroves have been cleared to cash in on the shrimp export boom. Now those shrimp farms are under threat from climate-related flooding. Even Java's fifth largest city is battling rising tides. Vietnam too is vulnerable. A one-meter increase in sea level will destroy much food production in the Mekong Delta – the nation’s breadbasket – and force millions to flee, so the country is fighting back. Earth Report investigates.