[far sider]

Lurking,

Thanks for the correction. Apparently many scientists say that human-caused and natural sources are about equal, so I was wrong to say "by far." I must have been confused with another element, like cadmium, that is mostly generated by man. (Feel free to correct me on that, too.)

The output from one vulcano (pinatubo, St Helens, etc) can exceed all human sources of mercury emissions for decades.

Where where have you seen this statement?

[LurkingSince'98]

Generalizing from the statement that one single volcano, can emit enough sunlight absorbing soot to cause a nuclear winter. For example, Krakatoa erupted in 535 AD causing sky darkening and cooler weather globally for over a year.

Mercury, is emitted adsorbed onto the surface of soot and would come down as rain as the soot washes out of the stratosphere.

It is a type of chauvinism and arrogance to think that humans can significantly effect weather on a global scale rivaling what nature already does.

Regards,
Lurking’