In discussing what defines functionally extinct ice, it's also clear that
the term ice-free arctic is not well defined: if ice extent is generally
defined as the area with 15% continuous ice cover, then the whole arctic as
ice free seems to be starting to get defined in some circles as that
Thanks, Mike, for the excellent responses, with which I agree 100%. Do you
have handy a link to the new UNEP assessment you mention? I'd much like to
see it.
One of the things that often perplexes me is why CCS from burning coal at a
plant is generally
considered geoengineering, but trapping the
Hi Nathan,
Please let me clean up my statement here. I think you have just made my
point in that we are getting a good handle on the complexities of the many
chemical/biological issues of the different aspects of GE. And, that
accumulation and synthesis of knowledge isby and largefrom
The Summary for Policymakers of the UNEP/WMO report, which is all that I
think is so far released, is at
http://www.unep.org/dewa/Portals/67/pdf/Black_Carbon.pdf They basically
discuss something like 16 key emissions reduction targets to focus on first
or most aggressively (or maybe just to show
