well, bruce..a couple volcanos might indeed give us a temporary, but unpleasant, bit of cooling. Can't say I like the idea...

and SINSULL's main point...that 'we' are not required for the Earth to chug merrily along... is also quite true. It is rather a philosophically oriented point, but pragmatically true. I guess I'm glad I won't be around when someone has to face that directly.