Dental mercury is just another chemical pollution problem to add to our very long list of problems. Do not have all your amalgams replaced until you have solved other, bigger problems first, especially food problems. Do ask for non-mercury fillings if new ones must be placed. A careful, conscientious patient who has solved food and environmental problems in large measure but still remains ill may consider complete amalgam replacement as a further problem-solving option. Rain becomes radioactive.
Cisterns collecting rain for drinking water are immediately suspect.
Soils contaminated by radioactive fallout produce crops with increased radioactivity for years to come. Animals grazing on contaminated fields will concentrate isotopes, like strontium-90, in their tissues, and will pass the isotopes on to the carnivore who eats them. Plutonium, with a half-life of 24,000 years, is the most dangerous isotope produced in nuclear reactors. I 131 has a short half-life of 8 days and poses only an immediate danger to those directly exposed to radioactive fallout. Concentration and storage of the isotope in the thyroid increases the risk of cell mutation, and the subsequent emergence of cancer.