Mercury comes out of the ground, when you dump the CFLs, the mercury goes back into the ground.
Sort of like recycling.
Nature is a prolific dumper.
For years, California geologists have shown an outcrop of "burnt" reservoir. It was a huge oil field that was exposed at surface ages ago by natural erosion; it began to seep and was evidently ignited by lightning. It will have burned for years, perhaps centuries, and meanwhile was progressively exposed by erosion. So ..... whom to arrest?
A geologist I knew 40 years ago once led field trips up into Arkansas to observe certain outcrops. One of his stops featured a cinnabar seep at surface. Cinnabar is the sulfide of mercury; it's dark-red and toxic as hell. He and his students would always take a gallon milk-jug or two along with them and fill it with naturally-flowing cinnabar, then take it home and sell it for a pretty penny. Cinnabar was worth a lot. The other 364 days a year, the cinnabar flowed unimpeded, as it had for millennia, into the nearest creek and eventually down to the sea. The geologist has been "at rest" for some 25 years now. What odds anyone remembers how to get to that cinnabar seep, or even where it is -- much less whom to bust?