If global warming causes coastlines to come in a few dozen miles as ocean levels rise, the overall environment will improve. How? Well, since people won't have to drive as far to get to the beach, they'll use less gas and generate pollution! And, even better, people won't want to go to beaches anyway, since they will be filled with partially-submerged houses, rotting trees, streetlights, telephone wires and all the other crap with which we decorate the Earth.