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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Many environmental advocates have long been critical of sludge-based fertilizers because they can contain contaminants like heavy metals.
Source: https://www.nhpr.org/2023-04-10/our-sewage-often-becomes-fertilizer-problem-is-its-tainted-with-pfas