Thank God for garbage disposals. Seriously. On your knees. Because Mayor Gavin Newsom just signed a ruling calling on all San Franciscans to compost their eggshells, coffee grounds, apple peels, dead roses and other food rubbish and garden clippings. While city officials will give residents time to adjust to storing their waste in a green bin, they "could eventually start levying fines of $100 on rubbish recidivists." (Thankfully, many residents are now too cash-strapped to afford real, non-prepackaged food, so many of you don't have to worry. Yay, hunger!) If you recall, the Board of Supes OK'd the country's toughest composting law earlier this month.