New York Times: You may not carry a laptop case made out of recycled fixed-gear bicycle tires. And it has probably been a while since you used yak dung to heat your home. But, hey, youre an environmentalist. At least, thats what you and your fellow boomers tell those pollsters whenever they ask. So why is your carbon footprint bigger than the footprint of the T. rex that turned into the oil youre using in your Prius? When researchers tried to calculate carbon dioxide emissions by age group in the United States,...