“…In fact we have devoted attention to many in situ nature‐based treatment techniques as part of this regular column series, starting with in situ metals precipitation in 2009 and moving to engineered anaerobic bio‐oxidation, temperature‐activated auto‐decomposition reactions, and enhanced reductive dichlorination (Suthersan et al , , , ). Last year alone we wrote about reactive mineral‐mediated abiotic contaminant transformation, bioreactors for high concentration contaminant mixes, and bioremediation of 1,4‐dioxane (Horst et al , , ).…”