I live on Puget Sound in Northwestern Washington State, Bellingham. Every body of inland water, in my part of the state, has warnings posted for methyl mercury, a by-product of coal burning. Fish are unsafe to eat. Our prevailing source of weather and air, is off of thousands of miles of Pacific Ocean. Methyl mercury is an airborne chemical.
I perceive this as a global problem.
One important aspect of chemical toxins, is that when combined with other unrelated toxins, in our bodies for example, the effective toxicity level INCREASES dramatically. Small amounts of methyl mercury alone MAY be "safe". But when combined with literally hundreds of other toxins in our bodies, the safety level is highly suspect! This cumulative effect is more often that not, overlooked and ignored.
PEACE
Tom