Interestingly enough, there has been a study from London School of Hygiene & Tropical Medicine about the two. It points out rather simple points that people that weigh more end up consuming more food and driving more often, both of which release more CO2 into the environment.
As for actual correlation, there is not much data to determine a trend. Most of the studies of the percentage of overweight and obese people have only been done once in few years, resulting in data like this:
Global warming has been measured much more precisely (see below), but the lack of data on obesity would make the correlation very unreliable.
Another point to make, even if someone does a detailed study to compare obesity and global warming, it would not imply causality between the two.
And this last one for a bit of humor right on the topic: http://failblog.org/2009/12/14/eco-board-game-trivia-fail/
Yes, average obesity and average global temperature are correlated, but correlation does not mean causation. Iphones purchased and global warming are also correlated, but I don’t think it’d be fair to yell at Steve Jobs for causing global warming the next time he’s in public, as amusing as that might be.
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