contender for award for the most tenuous link to climate change

But now there is a new charge against carbon dioxide that may strike more deeply at the heart of American public opinion: The claim that it promotes obesity.

But why blame CO2? The evidence here is more circumstantial, but Danish researcher Lars-Georg Hersoug notes that atmospheric levels of the gas have risen during the same period and that in the United States, obesity has increased most rapidly on the East Coast, where CO2 concentrations are highest.

Hersoug has so far conducted just one test of his hypothesis, an experiment in which six young men were placed in special climate rooms for seven hours. They were then given the opportunity to eat as much as they wanted, and those who had been exposed to increased CO2 levels ate six percent more than those who had not.
Raw Story, 16/3/12