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Lawns may be nice, but they don't absorb a lot of carbon dioxide. Plant a tree. A single tree will absorb one ton of carbon dioxide over its lifetime. Shade provided by trees can also reduce your air conditioning bill by 10 to 15%. If you have children, plant one tree for every year they are alive and measure their growth each year. Plant them in a pubic park so that everyone can enjoy them. Tired of sitting in the sun to watch your children's sporting events? Ask if you can plant trees on the sidelines of municipal fields. Donate a tree to your local civic association, school, or church. Plant roses in your front yard. Plant a garden in your back yard and save money on vegetables. If you live in a housing development, petition the Association to allow you to plant trees in public areas. Even better, build benches under them to promote community living. The Arbor Day Foundation will send you 10 trees for a $10 donation.