People picture coral reefs as bursting with color and teeming with a variety of undersea life, which many are. But their number is shrinking, says College of Charleston biologist Phil Dustan, because they are hyper-sensitive to temperature changes, and climate change is warming the ocean to intolerable levels for many reefs. In his 40-plus years of studying reefs, Dustan said, the Florida Keys, for example, have probably lost 90 to 95 percent of their living coral reefs. Dustan was featured in