> flame retardant chemicals used to treat geofoam were shown to be accumulating in the ground, which led to their [i.e., the flame retardants’] discontinuation

> flame retardant chemicals used to treat geofoam were shown to be accumulating in the ground, which led to their [i.e., the flame retardants’] discontinuation in Europe but not the US It appears that people are paying attention to the ecological impact. (In some places, at least.)