Subject: how do the murcury levels in tuna realy effect us

with the growing concern over mercury levels in tuna i had a question. if the mercury levels are being 
caused by the crumbling of rocks and soil, which contain the heav metal mercury, into the sea, then surely 
this is not a new phenomenon. if so there should be a noticable difference of the supposed consequences 
in countries with a fish based diet (scandanavia etc). Is there any solid proof that this is a reasonable 
concern or is it a minor concern that is clown out of proportion by a scared consumer base(cfc,microwaves 
come to mind)

Re: how do the murcury levels in tuna realy effect us