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Brown bananas, stale bread, and other scraps from grocery aisles and commercial kitchens used to get dumped by the ton into Massachusetts landfills. Not anymore. In October, the Bay State put into effect a far-reaching ban on throwing away organic waste: For large producers that generate one ton or more of organic waste per week, the new ban means “compost or donate,” or else face penalties, says David Cash, commissioner of the Massachusetts Department of Environmental Protection (DEP). Statewid…