AYR, SCOTLAND - OCTOBER 27:  A farmer in Ayrshire tends to his Highland Cattle on October 27, 2009 in Ayr, Scotland. Climate change campaigners have warned we must become vegetarians� to help save the planet, research claims that raising livestock is harmful to the environment and that vegetation would thrive on any unused farmland. Getty Images logo Getty Images 1 month ago

AYR, SCOTLAND - OCTOBER 27: A farmer in Ayrshire tends to his Highland Cattle on October 27, 2009 in Ayr, Scotland. Climate change campaigners have warned we must become vegetarians� to help save the planet, research claims that raising livestock is harmful to the environment and that vegetation would thrive on any unused farmland.