Carbon Math

Dizzily complex and o-so-interesting...

A Reporter at Large: Big Foot: Reporting & Essays: The New Yorker: "A person’s carbon footprint is simply a measure of his contribution to global warming. (CO2 is the best known of the gases that trap heat in the atmosphere, but others—including water vapor, methane, and nitrous oxide—also play a role.) Virtually every human activity—from watching television to buying a quart of milk—has some carbon cost associated with it. We all consume electricity generated by burning fossil fuels; most people rely on petroleum for transportation and heat. Emissions from those activities are not hard to quantify. Watching a plasma television for three hours every day contributes two hundred and fifty kilograms of carbon to the atmosphere each year; an LCD television is responsible for less than half that number. Yet the calculations required to assess the full environmental impact of how we live can be dazzlingly complex. To sum them up on a label will not be easy. Should the carbon label on a jar of peanut butter include the emissions caused by the fertilizer, calcium, and potassium applied to the original crop of peanuts? What about the energy used to boil the peanuts once they have been harvested, or to mold the jar and print the labels? Seen this way, carbon costs multiply rapidly. A few months ago, scientists at the Stockholm Environment Institute"