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Trees help reduce greenhouse gases in the atmosphere by absorbing and storing carbon dioxide. The Intergovernmental Panel on Climate Change estimates that 100 billion metric tons of carbon over the next 50 years could be sequestered through forest preservation, tree planting and improved agricultural management.

Planting native trees on a smaller scale also helps. Landscaping that shades a home can cut air conditioning use by 50 percent, according to the American Public Power Association.