Associated Press: Global warming will eventually push one out of every 13 species on Earth (7.7 per cent) into extinction, a new study projects. It won't quite be as bad in North America, where one in 20 species (five per cent) will be killed off because of climate change, or Europe, where the extinction rate is nearly as small. But in South America, the forecasted heat-caused extinction rate soars to 23 per cent, the worst for any continent, a new study published Thursday in the journal Science states. University...