Well, dufus, if you and the rest of the global warming crowd think doubling the amount of mercury introduced by man somehow equates to doubling the natural baseline we see how the whole green scam advances in your thinking.
The percentage of mercury introduced by man is as tiny a percentage as the portion of CO2 that is introduced by man.
You toddle off to your earthday planning comittee and have a nice day. Don’t cry if anyone says anything mean.
Citation, please.