Hi,
I work on a personal website to identify the cheaper offer for shipping rates, for eBay or any e Business websites checkout.
Compare Shipping Rates for more informations.
I should have soon a formulas to provide informations about Carbon Dioxyde emitted by a shipping, and be able to provide this information so that a website can display this information in shopping cart and give an option for customer to compensate Carbone, giving compensation to any NGO working on this.
Moreover this informations can help customer to choose a slow shipping method, better for environment than air freight.