How human beings are exposed to mercurry toxicity?

Well you see, for a long time all the big city lights were mercury vapor bulbs. And when they were changed they were dumped in the oceans and other places like the Everglades in Florida. That's why you can't eat the fish caught in and around the everglades. I'm sure these were dissposed of in Lakes and Landfills that contributed to the mercury leaking out of the bulbls. Hope this helps.