Fat drivers increase Co2 emissions by 2.6 MILLIONS TONS per year? I've been wanting to put together some research to see what harm fat people do to the environment and started with car emissions. The carbon footprint from extra food and A/C use will likely be much higher. I gathered this data pretty quickly, so please comment with better info if you have it. Math: There are some things missing from these calculations, including overweight of just drivers, whether other overweight people are in the car, and other things, but it gives a general idea of something that I've never seen mentioned in media/environmental circles. This amounts to around .05% of America's total Co2 emissions.