This article smacks of the kind of desperation we've become more and more accustomed to.
One thing I didn't see in the article is how the balance is affected by differences in life expectancy. If thin people live 20 years longer, on average, than heavy people, is that enough time to make up the difference in CO2 output?
Sorry about that. For a moment there I actually considered this "study" something worth more than abject ridicule. I will refrain from further comment until it can be determined what affect ridicule has on the environment.