For those that don't want to sign their life away to Dallasnews.com, here's a summary:
-Thru the 90s, avg weight of Americans gone up 10lbs, causing increase of $275m to burn 350m more gallons of fuel in 2000
-3.8m extra tons of CO2
-65% of Americans overweight or obese 1999-2002
Airlines charge obese passengers an extra seat
-Alaska Airlines include a child weight figure in their passenger calculations
It's not just people either - why should I subsidise my co-traveller's 30kg of bags when I've only got 10kg?