Agence France-Presse: 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 today. A two degree hike would threaten 50 per cent of breeding grounds of emperor penguins, and 75 per cent of Adelie penguin colonies, said the study, released by the World Wildlife Fund (WWF) at the World Conservation Congress in Barcelona. The United …