UN says eat less meat to curb global warming | Environment | The Observer
http://www.guardian.co.uk/environment/2008/sep/07/food.foodanddrink

People should have one meat-free day a week if they want to make a personal and effective sacrifice that would help tackle climate change, the world's leading authority on global warming has told The Observer

even skipping meat one day a week makes an impact

UN says eat less meat to curb global warming | Environment | The Observer