I ran across this Wired Article on a new business venture that lets common consumers buy their carbon back. What caught my eye was the interesting note: every gallon of gas burned results in 20lbs. of carbon dioxide added to the air.
At first, this struck me as impossible, since I went and looked up the weight of 1 gallon of gasoline: 8.66lbs. Then Joy reminded me of my chemistry, and that the rest of the weight comes from the Oxygen that binds in. So, you take a fairly simple hydrocarbon chain, and you replace the hydrogens (molecular weight ~1) with Oxygens (molecular weight ~16). Heptane (see the hydrocarbon link, with 16 Hydrogens to 7 carbons, burned ideally produces 7 CO2 molecules. So, it's not too hard to see how such a great weight of CO2 gets released. Fortunately, there's a lot of air out there, but not so much that we aren't still increasing carbon in the air.
The market model for dealing with this is an interesting one. I'm probably going to buy a TerraPass or two, to buy back my carbon, effectively making me “carbon neutral”, and, in effect, fund development of carbon-reducing technologies. Ironically, because of my scooter, I drive my car in the range that they sell a “Hybrid” pass for, even though my 2001 sedan only gets about 26 mpg. Frankly, between how little I drive my car, and the better mileage of my scooter, and living in an area that generally doesn't need much heating and cooling, my carbon footprint is probably pretty good compared to many in the US... but still pathetic. More on this as I can figure out real numbers for it.
I like the concept of pounds of carbon dioxide... mostly because, yes, it sounds a lot worse than it (directly, at least) is. You can play games all day, but it's still interesting to think how my commute puts an average of about 5 lbs. of CO2 in the atmosphere each day. If I did the same commute in an SUV, it'd be more like 20lbs.
More thinking on this needs to be done, though. On the TerraBlog, one of the posts observes how much power is generated by humans, say, on a bike race. Unfortunately, even that isn't a fair comparison - how much more CO2 are those bikers breathing out than they would be if they weren't producing the excess work? What's the ratio of human CO2/mile vs. the CO2/mile of my scooter (~0.37lb/mile) vs. that of a SUV (~1.5lb/mile)?
Tags: alternativetransit, carbonneutral, scooter