Great Barrier Reef enters crucial period in coral bleaching
By ROD McGUIRK, Associated Press CANBERRA, Australia (AP) — The Great Barrier Reef is facing a critical period of heat stress over the coming weeks following the most widespread coral bleaching the natural wonder has ever endured, scientists said Friday. David Wachenfeld, chief scientist at the Great Barrier Reef Marine Park Authority, the government agency that manages the coral expanse off northeast