“….The trees stand about 30 feet high. More important, their roots extend 30 feet down, where they tap the contaminated aquifer and literally pull pollutants out of the ground….Under normal circumstances, tree roots prefer to sip water from sources as close as possible to the surface. But these trees, planted in 1999, don’t have that option. They are impressed laborers, set into plastic-lined pits that force their roots to tunnel deep for drink. The roots lift the contaminated water into the tree trunks, where transport tissues conduct it on up to the branches and leaves. From there, as droplets transpire through leaf pores, the water evaporates and sunlight breaks down the dissolved solvent molecules, rendering them harmless.”
check it out for details 🙂
ah, the glory of trees.