Cows absolved of causing global warming with nitrous oxide - Telegraph

However a new study found that cattle grazed on the grasslands of China actually reduce another greenhouse gas, nitrous oxide. So china can eat meat but americans must stop. 

http://www.telegraph.co.uk/earth/environment/climatechange/7564682/Cows-absolved-of-causing-global-warming-with-nitrous-oxide.html