This morning's newspaper features an Associated Press article about a Brookings Institution ranking of the 100 largest US cities, based on per capita carbon emissions. The worst of the bunch is said to be Lexington, KY, with 3.46 tons per person as of 2005. My first reaction was total dismay. The article, the headline, and the accompanying chart all use the term "carbon footprint", and if we could get the average carbon footprint per US citizen down to 3.46 tons, we'd be in pretty good shape. The actual carbon footprint for an average US resident is on the order of 20 tons.