Whether municipal or industrial, sludge has a concentrated amount of heavy
metals. Many (most?) plants absorb heavy metals and you could get an unsafe
amount in your diet, not unlike the many warnings to not eat fish because of
mercury build-up within the bodies of the fish. >The solution to pollution
is dilution< Around here, sludge, and septic tank waste, is spread on
agricultural lands, hay fields mostly. The cows eat the hay and we eat the
cows; European farmers have been doing this for 'eons' with no (apparent)
ill effect.
. . .
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