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An Emperor penguin. Half to three-quarters of major Antarctic penguin colonies could be damaged or wiped out if global temperatures are allowed to climb by more than two degrees Celsius (3.6 degrees Fahrenheit), according to a report from the World Wildlife Fund.(AFP/Marcel Mochet)AFP - Half to three-quarters of major Antarctic penguin colonies could be damaged or wiped out if global temperatures are allowed to climb by more than two degrees Celsius (3.6 degrees Fahrenheit), according to a report released Wednesday.