How about coal-fired power plants exhaust?
Florida's coal-fired power plants released 2,182 lbs of mercury in 2001, ranking them #15 in the nation as reported by the 2003 report Toxic Neighbors.[3] The report also ranks Florida #4 in the nation total toxic chemical releases from coal-fired power plants, including dioxin, lead, and arsenic.
The annual addition of 1/70th of a teaspoon of mercury is enough to contaminate a 25 acre lake to the point where the fish are unsafe to eat.
source:http://64.233.169.104/search?q=cache:r8H8ryIDiacJ:www.cleanenergy.org/inYourState/subpage.cfm%3FID%3D23+coal+fired+power+plant+exhaust+toxic&hl=en&ct=clnk&cd=15&gl=us
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