
Kitchen garbage disposals use a lot of water and the waste has little value to other life forms after sewage-treatment systems are done with it. If you want to return food-based nutrients to the Earth, opt for composting, the spoils of which can be added to your garden to jump start the health of your soil. Photo: Getty Images.
ear EarthTalk: I was surprised to learn recently that some cities, including New York, have outlawed kitchen-sink garbage disposals, at least in homes. I would have thought these machines were Earth-friendly. What's the deal?
--Maggie Mangan, St. Louis, MO
Kitchen sink garbage disposals are not necessarily Earth-friendly in and of themselves, but they do play a valuable role in grinding up food scraps into small enough bits for local sewer or on-site septic systems to handle. In the U.S. overall, about half of all homes have a garbage disposal in the kitchen. New York did outlaw the devices for many years, thinking a ban would alleviate the strain on the city's aging sewer system. But a study later conducted in the mid-1990s found benefits to lifting the ban, including a likely reduction in rat and cockroach problems and a reduced flow of solid waste to landfills already bursting at the seams. So in 1997 the Big Apple began allowing the devices again.