References “Trees Pay Us Back,” US Forest Service “Benefits of Trees and Urban Forests: A Research List,” Alliance for Community Trees i-Tree calculator, US Forest Service "Modeled PM2.5 Removal by Trees in Ten U.S. Cities and Associated Health Effects,” US Forest Service Woodman Spare That Tree, 1837, First Environmental SongSimi Summer, Ph.D. is an organic advocate, independent researcher, educator, and free lance writer. She is a strong proponent of organic consumer education and informed consumer choices.
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