After using chemical fertilizers for a few seasons, we experienced significant crop destruction from insect invasion. Again chemicals provided the solution in the form of a pesticide called DDT and again we were assured that this chemical was safe. After using DDT for a while we discovered that it was not safe but was in fact a powerful cancer-causing substance. In addition, we discovered that the insects that were not killed by the DDT produced offspring that were immune to it. The simple fact is, many chemicals that are marketed as totally safe for humans are later found to be harmful.
Pesticides encompass several different chemical categories.