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- From: userDHAL@mts.ucs.UAlberta.CA (David Halliwell)
- Subject: Re: Gallup Poll on Global Warming
- Message-ID: <dhalliwe.716517558@muskwa.ucs.ualberta.ca>
- Sender: news@kakwa.ucs.ualberta.ca
- Nntp-Posting-Host: muskwa.ucs.ualberta.ca
- Organization: University Of Alberta, Edmonton Canada
- References: <1992Sep8.201012.3286@meteor.wisc.edu> <6195@taurus.cs.nps.navy.mil> <STEINLY.92Sep12144323@topaz.ucsc.edu> <1992Sep14.182707.12523@daffy.cs.wisc.edu> <STEINLY.92Sep14125144@topaz.ucsc.edu>
- Date: Tue, 15 Sep 1992 00:39:18 GMT
- Lines: 56
-
- steinly@topaz.ucsc.edu (Steinn Sigurdsson) writes:
-
- >In article <1992Sep14.182707.12523@daffy.cs.wisc.edu> tobis@skool.ssec.wisc.edu (Michael Tobis) writes:
-
- >Hey, wow, this is turning into a nice thread...
-
- > In article <STEINLY.92Sep12144323@topaz.ucsc.edu>, steinly@topaz.ucsc.edu (Steinn Sigurdsson) writes:
-
- > |> Yup, the problem is that is not the question public policy asks...
-
- > Now wait just a cotton pickin minute. This thread startes with a typical
- > misrepresentation of the opinion of climate scientists that one sees in
- > certain branches of the media these days. That we did not address the
- > question you wanted answered is not because of evasion, but because that
- > question hadn't been raised.
-
- >Eek. I'm not sure which side the miscommunication is on, probably
- >somewhere in the middle ;-) But, the question being asked was not
- >necessarily the question that was heard... plus there is the
- >understandable tendency of scientists to obey the drunk-by-a-lightpole
- >rule and answer questions that are answerable, not those that need answering...
-
-
- I agree with Michael. The thread started as a discussion of climatic
- forcing and climate models. To interject with a claim that "we need to know
- carbon cycling to predict future atmospheric CO2 levels" as a criticism
- of climate models is unreasonable. It is sort of like saying to the drunk
- that he is in no state to drive. It may be true, but all he is trying to
- do is lean on the lightpole, and has no intention of trying to drive....
-
-
- >Interesting, my guess had been vegetation albedo was negligible.
-
- Again, vegetation albedo may be a rather important consideration.
- I know of one study that has looked vegetation changes over the last
- few hundred years - mostly associated with clearing forests and other
- natural ecosystems for agriculture - and concluded that the albedo
- change may have caused cooling of up to 0.5C. There is still a great
- deal of uncertainty over how vegetation patterns will change - and
- how quickly - in a doubled CO2 climate. One of the major problems is
- the anticipated rate of climate change: there are virtually no good
- analogues in the historical record to suggest how vegetation and
- ecosystems can adapt and shift. One expectation is that current
- vegetation may tend to remain stable for a while, and new vegetation
- will only move in after major disruptions such as fire. With major
- ecosystem zones moving poleward, some vegetation types may be squeezed
- out as a result of combinations of climate and soil limitations. The
- new ecosystem distributions may show large changes in area covered.
-
-
-
- Dave Halliwell
- Department of Geography
- University of Alberta
- Edmonton, Alberta
-
-