the waste in the field. The most passive form of bioremediation is natural attenuation, where no direct engineering intervention is used, and the contaminants are allowed to be degraded by resident microbes over time. The only role for the engineer is to monitor the soil and groundwater to measure the rate at which the chemicals are degrading. Natural attenuation can work well for compounds that are found in the laboratory to break down under the conditions found at the site. For example, if a compound is degraded under reduced, low pH conditions in the laboratory, it may also degrade readily in soils with these same conditions (e.g., in deeper soil layers where bacteria have adapted to these conditions naturally). Natural attenuation can sometimes be enhanced, for example, when soil moisture levels are increased. Thankfully, we have these machines now. Certain plants, it turns out, have a particular gift for sucking up specific chemicals, either as a quirk of their biology or as a way to make themselves poisonous
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