Tree facts

Did you know that trees maintained over a 50-year lifetime can generate $US31,250 worth of 0_2 , provide $US62,000 worth of air pollution control, recycle $US37,500 worth of H_2 0, and control $US31,250 worth of soil erosion (USA Forest Service - Pamphlet #R1-92-100). In addition one acre of tree cover can give the equivalent of 2.8 t O_2 /year and clean 330 lbs of CO_2 (90 lbs C) from the atmosphere through direct sequestration. The cost-benefit implications of natural green space, calculated through direct estimation and implied valuation, of a single Arizona tree planting program, could provide a $US236.5 million net environmental benefit over a 40-year time frame.