Here are some environmentally recommended tips taken from the Minnesota Pollution Control Agency (MPCA): When leaves and grass are mixed with a little soil, water and air, bacteria compost wastes into a rich soil amendment. Composting reduces yard waste volumes by 80 percent and mass by 50 percent. Leaves and yard waste should not be raked into streets, gutters or water bodies. The wastes can travel through storm sewers to rivers or lakes, where they can increase algae growth and reduce the oxygen available to fish and other aquatic life. Grass clippings from fertilized lawns are particularly bad. Yard waste can be left on lawns or used to insulate plants for the winter. Leaves and grass composted at home will continue to break down at a slower rate through winter.
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Source: http://wasteage.com/mag/waste_rake_leave_tips/