your're preaching to the chorus laura, there's ample evidence that man made chemicals cause all sorts of diseases in humans and animals. kind of why we have the FDA, EPA.
almost impossible to get highly profitable chemicals banned without tremendously strong evidence. noone wants to put DOW, MONSANTO, BAYER, CHEVRON, DUPONT, etc. out of business.

my point was i didn't think the pre-industrial revolution environment was all that pristine 24hrs/day, 12months/year and pd likely existed.