A good rule of thumb is. If it's cheap, it didn't burn too much energy! A trip to the store is purely C02 expense of almost a dollar. A dollars worth of lime, p

A good rule of thumb is. If it's cheap, it didn't burn too much energy! A trip to the store is purely C02 expense of almost a dollar. A dollars worth of lime, probably has C02 expense in the range of almost 10 cents.