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Australia's Great Barrier Reef will lose most of its coral cover by 2050 and, at worst, the world's largest
coral system could collapse by 2100 because of global warming, a study recently said.
The study by Queensland University's Center for Marine Studies, commissioned (委托) by the Worldwide
Fund for Nature, said that the destruction of coral on the Great Barrier Reef was unavoidable due to global
warming, regardless of what actions were taken now. "Under the worst-case scenario, coral populations will
collapse by 2100 and the reestablishment of coral reefs will be highly unlikely over the following 200-500
years," said the report entitled "Implications (可能的影響) of Climate Change for Australia's Great Barrier
Reef."
The Great Barrier Reef is the world's largest living reef formation stretching 2,000 km north to south along
Australia's northeast coast. "Only if global average temperature change is kept to below two degrees Celsius
can the Reef have any change of recovering from the predicted damage," the report said. Coral has a narrow
comfort zone and is highly stressed by a temperature rise of less than one degree Celsius. Water temperature
rises of less than one degree coincided (同時(shí)發(fā)生) with the world's worst recorded coral bleaching (顏色變淡)
period in 1988. The warmer water forces out the algae (海藻) that give coral its color and, if all are lost, the
coral dies and the reef will die out. In 1988, 16 percent of the world's coral died, with 46 percent of the Indian
Ocean coral destroyed.
Scientists express water temperatures to rise this century by between two and six degrees Celsius. "There
is little to no evidence that corals can adapt fast enough to match even the lower temperature rise," said the
report. Over-fishing and pollution from coastal farms were also contributing to the destruction of coral on the
Great Barrier Reef.
The Great Barrier Reef supports huge fishing and tourism industries. Even under favorable conditions
tourists would only be able to experience real corals in reef "theme parks".
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