Of that 4-5 trillion, 80 million plastic shopping bags are distributed in San Francisco each year. Those numbers are one doozy of a wake-up call. We've felt a little guilty about using plastic shopping bags for our garbage and cat litter, and plastic newspaper bags when we walk our dog. Now we feel really guilty, and we're totally behind the groundbreaking legislation -- San Francisco leads the way again! -- outlawing plastic bags at supermarkets in about six months and chain pharmacies in a year.