Climate Desk: Among the hundreds of recommendations listed in Mayor Michael Bloomberg`s $20 billion plan to protect New York from climate change is a call to stock up on oysters. Not the kind you`d want to knock back with a nice pilsner on a Friday afternoon: The idea is to build large underwater oyster reefs around the harbor that could prevent coastal erosion and absorb storm surges. "Soft" infrastructure like this--reefs, wetlands, dunes, and other "natural" systems--is gaining in popularity over "hard" levees...