As we have slowly focused our attention on global warming - after all it did take us only about 20 years to become concerned - the term " carbon footprint " has become sort of familiar. Every individual, household, industry, company, and product has one; it is a way of measuring and conceptualizing the impact of each of these on the environment because of the amount of greenhouse gases it produces by burning fuel. We prefer the less familiar term, " ecological footprint ." This...