We know that the seas rose many meters just after the most recent ice age, most likely on the order of 300 to 400 feet. Coral reefs did not die during the ice age, nor did they die during the ice melting period with the sea levels rising. As discussed elsewhere, several times during the past 12,000 years, the rate of sea level increase was much higher than that of today.
Coral reefs are darlings of the tree-huggers because they support a variety of sea life, and they look pretty in photographs. It is also fun to fly to a tropical paradise, don the snorkel, face mask, and swim fins, and swim around near a tropical coral reef.
So, who are we going to believe, the obvious facts staring us in the face, or the gloom-and-doom AGW Carbon is Killing Us crowd?