Telegraph: Churning out 488 grams of carbon dioxide every kilometre, 322 mature oak trees would be needed to absorb the American sports car’s emissions in a year, experts warned. The Environmental Transport Association made the disclosure following a study of more than 1,300 models of cars currently on sale in Britain. Meanwhile, green celebrity favourite the Toyota Prius lost its crown as the country’s most environmentally friendly car. The hybrid vehicle driven by Gwyneth …