Is it greener to shop online or at the store? The answer depends how far you drive. If you live near stores that are in close proximity of your house -- less than 10 miles away -- buying locally is the greener way to go. But if you drive more than 20 miles round trip to a store, buying items online will be more environmentally friendly and probably more convenient to you. Even with overnight air shipping, The Center for Energy and Climate Solutions says two 20-pound boxes is more energy efficient to order online and have delivered than driving those 20 miles. The trick to be the greenest is to elect ground shipping and to buy only what you need.