One of my favorite topics! Some examples:
You would be using 16 pounds of cow manure in place of 1 pound of synthetic fertilizers to get the same amount of nitrogen. That other 15 pounds of "stuff" is organic, but it ain't heaven either!
Round Up - the most effective weed killer - is really a sophisicated form of salt water, and is very low in toxicity, despite it's effectiveness. Like your local tavern serving salty pretzels to make you thirsty for more beer, it makes the plants thirsty, but they can't go get a drink!
In fact, many pesticides are scientifically proven to be less toxic than your morning cup of coffee! Once, when we had the pest service over to the house, he demonstrated the difference in effects on a small bug and a large bug. The small gnat was killed instantly, while the roach just started hobbling around. If the sensitivity of the chemical is so different to mere bugs, even if the toxicity was present for humans, our body weight would render the effects almost nil. (It has been shown that pesticides do affect young children the most)
The unkown story behind pesticides is that supers use far less than they used to. They also are using scientifically blended materials that break down quicker, go on at lighter rates and are still effective, and are less toxic than they used to be.
IMHO, the emotional aspect of pesticides is overblown compared to the actual damage they may do, and often fails to include the benefits of using them, as well. (Or do we think a "natural" plague of locusts would be a good thing!?
) I think the emphasis should be on continuing using science to reduce rates, make sure they go where they should go, and to break down in the soil quickly if they go somewhere else.
If you are in a postion where someone is trying to require you to go organic, which I think is both impractical right now, and perhaps forever - I believe science can produce something better than an all natural product for a specific use - I would collect as many facts as possible to combat it. After all, you live with the results and problems of an organic program