This article/study claims lab meat would be more energy efficient: http://pubs.acs.org/doi/abs/10.1021/es200130u http://pubs.acs.org/doi/abs/10.1021/es200130u

This article/study claims lab meat would be more energy efficient: http://pubs.acs.org/doi/abs/10.1021/es200130u http://pubs.acs.org/doi/abs/10.1021/es200130u Linked from the New Scientist article.