that is just it — these chemicals are at the moment so poisonous they kill or seriously injure the people working in the fields. They do not work anymore, the wild plants develop antidotes faster than scientists develop poisons. If all was grown naturally, there would be no need for all this. Everything would be organic, like it used to be 100 years ago, and no one would need to worry about it. It is all about the money.. Chemicals are big business.