Protein leverage hypothesis presents a potential explanation for the observed increasing obesity rates for people and animals worldwide in recent decades. One of its more distinguishing attributes compared with other obesity hypotheses is that it presents a potential link between obesity and environmental parameters such as CO2 percentage in the atmosphere. http://weightoftheevidence.blogspot.com/2012/12/the-protein-leverage-hypothesis.html http://sydney.edu.au/science/outreach/inspiring/news/cpc.shtml http://www.ncbi.nlm.nih.gov/pubmed/15836464