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I was doing some reading and stumbled over the fact that DDT was already discovered in 1874 but its insecticidal properties were only discovered in 1939.

What would happen as by some coincidence this property is discovered early, lets say 1900.

apart from an increase in crop productivity and reduction of certain diseases (like typhus) i could also see lots of bad things happening like good species getting killed off, and poisoning of humans.

And how long would it take to recognise the bad effects?

your thoughts on this?

http://en.wikipedia.org/wiki/DDT
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