Green Newton

Consider using non-toxic de-icing substances such as clean clay cat litter, sand, or fireplace/stove ash to prevent hazardous waste from chemicals. Chemical de-icers can be hazardous to your pets, your trees and shrubs, and the environment. Antifreeze that leaks from car engines and chemical snow melters on driveways, roads, and runways can pollute surface waters and groundwater through the soil.  http://www.epa.gov/epahome/hi-winter.htm#wa