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His point was they are/were using chemicals regardless of if they understood the chemistry at a low level or not. When ancient people/(or modern) used dung to fertilize crops they are using chemicals. With that being said I think when the power of modern chemistry / genetic engineering and modern economic agricultureraly forces collide caution is warranted.

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>His point was they are/were using chemicals regardless of if they understood the chemistry at a low level or not.

Even if that was his point, it is still completely wrong.

>It is impossible to produce food without chemicals.

If you live in the northern hemisphere, it is only June. Go plant a handful of pumpkin and watermelon seeds in a patch of fertile earth. Add no "chemicals" of any kind - man made or otherwise. Return in 4 months and you will very likely see food that has been grown with absolutely no chemicals at all.

Fertile earth is composed of chemicals. Water is a chemical. Air is composed of chemicals. The seed is composed of chemicals.

It is impossible to grow food without chemicals.

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