Reforestation: When trees are gone we lose not only the oxygen they provide us with, but also all other services.
Trees provide us with shadow, weather stabilization, and they are also home for birds, monkeys, bats, ants, etc.
You can volunteer any day of the week planting trees in Oakland with:
Urban ReleafOakland Office
Urban Releaf
835 57th Street
Oakland, CA 94608
http://www.urbanreleaf.org/index.html