Poplar tees, inoculated with a probiotic, degraded the carcinogen, trichloroethylene, TCE, at a California contaminated site.  Sharon Doty, University of Washington, is using phytoremediation  as inexpensive green technology for  cleaning soil and water pollution from the environment. Plants naturally contain pollutant destructive bacteria, a process called phytoremediation. Doty soaked poplar tree cuttings with a probiotic that degrades TCE. The Poplars treated grew faster and larger than untreated trees. The water tested downstream was below EPA standards of safety.

Chemical and Engineering News, September, 11, 2017.