5. Lawn clippings
Grass clippings and other organic material from the yard should always be returned to nature via the compost pile rather than entombed in a plastic bag and sent to the landfill, where experts say it will take 500 years — give or take a century or two — for them to decompose in their plastic covering.
Also, consider reducing the size of your lawn by covering part of it with mulch or planting a low maintenance ground cover. Lawns are hard on our wallets and hard on the environment, what with all of the fertilizers, pesticides and water they require.