Both then and now, I don't think it hurts the ground or the grass
much, but it's poisonous to dogs and cats, iirc. If we could only get
the cats to drink it and somehow protect the dogs.
It's bad when the rain makes it run off into streams.
Ethelene glycol breaks down into CO and water. It's half life in
both air and soil is about 1 day. However, engine coolant
(particularly old, used coolant) is more than just ethylene glycol and
water. It contains additives (many of which, today, are organic acids)
as well as heavy metals as the product of corrosion. The heavy metals
don't break down - so it is a good idea to dispose of the stuff in a
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