Ubiquitious pesticides

In a study conducted by the University of Granada and Andalusian School of Public Health in Spain, 100% of people (387 volunteers) had at least one kind of pesticide in their adipose tissue. The researchers tested for “persistent organic compounds” (POCs), chemicals that can enter the body through food, water, or air. The chemicals accumulate in adipose tissue (fat).
They tested for 6 different POCs, with the following results: 100% of the subjects tested positive for DDE (a metabolite of DDT, which has been banned in Spain since the 1980s). 91% had hexachlorobenzene (used as a fungicide and in industry banned in the US, accidentally released by some industrial processes). 92, 91, 90, and 86% had PCB-153, HCB, PCB-180 PCB-138 respectively. 84% had hexaclorociclohexano (used as an insecticide, including as a scabies and pediculosis treatment).
I’d wager that, if the percentage of Spaniards with some amount of POCs in their systems is so high, Americans are full of POCs as well. These are compounds that don’t exist in nature. Through genetic engineering, we can produce pesticides that still work, but that are from natural sources (having evolved in nature). We have the technology to let millions of years of evolution work for us – why not use what we have, rather than poisoning ourselves with synthetic chemicals?