Scientists worried by Reef bleaching

Scientists worried by Reef bleaching :

"Fresh concerns over coral bleaching on the Great Barrier Reef should prompt the federal government to sign the Kyoto Protocol, conservationists say."

It should, but it probably won't. Why should they worry if the reef is a whiter shade of pale? If other nations have considered the Kyoto Protocol to be very important, if respected environmentalists and scientists have endorsed it, and still America and Austrlia won't sign it, wouldn't you go white around the gills??