Bloody hell, thanks so much for this, I had no idea. What would be the word for this, "collateral war crime"?

FWIW, even though far larger quantities were sprayed over Vietnam, the spraying made the contamination less permanent than in the Netherlands. Hopefully most of what was sprayed in the war has been run off into the ocean, with no pluming and relatively little groundwater contamination.

Although "relatively" is rather less comforting when the contamination involves dioxins.