Patent US 6,250,237

A method of naturally removing or inhibiting pollutants. Tree stems are planted adjacent to or intersecting near surface ground water supply or adjacent a contaminated air source. The trees and rooted soil serve as a sponge and a pump to remove pollutants from water sources and serve as a buffer system to remove contaminants from air and polluted water sources. The system can also be used as a cap over landfills and brown fields to manage water.