It is ironic that I write this while traveling from Seattle to New York by airplane. Three years ago I set out to measure my carbon footprint from air travel. Back in 2007 I clocked nearly 70,000 miles and a carbon footprint on the order of 25 tons of CO2. In 2008 the number dropped to 56,000 miles and about 22 tons of CO2. This year, I've only flown about 29,000 miles for around 10 tons of CO2.
