We've celebrated the incredible power of microbes to clean our environment, but their success hinges on a critical fact: they are living organisms. Just like us, they need a comfortable environment to survive and thrive. When the conditions at a contaminated site are too harsh, even the most heroic microbe will fail. This is the first and most common reason a bioremediation project can struggle.

Our final All-Star is a microbe that solved one of the most widespread and difficult groundwater pollution problems in the world. Meet Dehalococcoides ethenogenes, a tiny bacterium with a very big and very specific job: it is the only known organism that can fully detoxify industrial solvents like tetrachloroethylene (PCE) and trichloroethylene (TCE).

When you see a fallen tree in the forest being broken down, you're likely looking at the work of this week's All-Star. White-Rot Fungi, which include well-known species like the Oyster mushroom (Pleurotus ostreatus) and Turkey tail (Trametes versicolor), are the undisputed champions of decomposition. Their unique talent is the ability to break down lignin, the tough, complex polymer that gives wood its rigidity and strength.