East Anglia Confirmed Emails from the Climate Research Unit - 880476729.txt

From: Tom Wigley <wigley@xxxxxxxxx.xxx>
To: jan.goudriaan@xxxxxxxxx.xxx, grassl_h@xxxxxxxxx.xxx, Klaus Hasselmann <klaus.hasselmann@xxxxxxxxx.xxx>, Jill Jaeger <jaeger@xxxxxxxxx.xxx>, rector@xxxxxxxxx.xxx, oriordan@xxxxxxxxx.xxx, uctpa84@xxxxxxxxx.xxx, john@xxxxxxxxx.xxx, mparry@xxxxxxxxx.xxx, pier.vellinga@xxxxxxxxx.xxx
Subject: Re: ATTENTION. Invitation to influence Kyoto.
Date: Tue, 25 Nov 1997 11:52:09 -0700 (MST)
Reply-to: Tom Wigley <wigley@xxxxxxxxx.xxx>
Cc: Mike Hulme <m.hulme@xxxxxxxxx.xxx>, t.mitchell@xxxxxxxxx.xxx

Dear Eleven,

I was very disturbed by your recent letter, and your attempt to get
others to endorse it. Not only do I disagree with the content of
this letter, but I also believe that you have severely distorted the
IPCC "view" when you say that "the latest IPCC assessment makes a
convincing economic case for immediate control of emissions." In contrast
to the one-sided opinion expressed in your letter, IPCC WGIII SAR and TP3
review the literature and the issues in a balanced way presenting
arguments in support of both "immediate control" and the spectrum of more
cost-effective options. It is not IPCC's role to make "convincing cases"
for any particular policy option; nor does it. However, most IPCC readers
would draw the conclusion that the balance of economic evidence favors the
emissions trajectories given in the WRE paper. This is contrary to your
statement.

This is a complex issue, and your misrepresentation of it does you a
dis-service. To someone like me, who knows the science, it is
apparent that you are presenting a personal view, not an informed,
balanced scientific assessment. What is unfortunate is that this will not
be apparent to the vast majority of scientists you have contacted. In
issues like this, scientists have an added responsibility to keep their
personal views separate from the science, and to make it clear to others
when they diverge from the objectivity they (hopefully) adhere to in their
scientific research. I think you have failed to do this.

Your approach of trying to gain scientific credibility for your personal
views by asking people to endorse your letter is reprehensible. No
scientist who wishes to maintain respect in the community should ever
endorse any statement unless they have examined the issue fully
themselves. You are asking people to prostitute themselves by doing just
this! I fear that some will endorse your letter, in the mistaken belief
that you are making a balanced and knowledgeable assessment of the science
-- when, in fact, you are presenting a flawed view that neither accords
with IPCC nor with the bulk of the scientific and economic literature on
the subject.

Let me remind you of the science. The issue you address is one of the
timing of emissions reductions below BAU. Note that this is not the same
as the timing of action -- and note that your letter categorically
addresses the former rather than the latter issue. Emissions reduction
timing is epitomized by the differences between the Sxxx and WRExxx
pathways towards CO2 concentration stabilization. It has been clearly
demonstrated in the literature that the mitigation costs of following an
Sxxx pathway are up to five times the cost of following an equivalent
WRExxx pathway. It has also been shown that there is likely to be an
equal or greater cost differential for non-Annex I countries, and that the
economic burden in Annex I countries would fall disproportionately on
poorer people.

Furthermore, since there has been no credible analysis of the benefits
(averted impacts) side of the equation, it is impossible to assess fully
the benefits differential between the Sxxx and WRExxx stabilization
profiles. Indeed, uncertainties in predicting the regional details of
future climate change that would arise from following these pathways, and
the even greater uncertainties that attend any assessment of the impacts
of such climate changes, preclude any credible assessment of the relative
benefits. As shown in the WRE paper (Nature v. 379, pp. 240-243), the
differentials at the global-mean level are so small, at most a few tenths
of a degree Celsius and a few cm in sea level rise and declining to
minuscule amounts as the pathways approach the SAME target, that it is
unlikely that an analysis of future climate data could even distinguish
between the pathways. Certainly, given the much larger noise at the
regional level, and noting that even the absolute changes in many
variables at the regional level remain within the noise out to 2030 or
later, the two pathways would certainly be indistinguishable at the
regional level until well into the 21st century.

The crux of this issue is developing policies for controlling greenhouse
gas emissions where the reductions relative to BAU are neither too much,
too soon (which could cause serious economic hardship to those who are
most vulnerable, poor people and poor countries) nor too little, too late
(which could lead to future impacts that would be bad for future
generations of the same groups). Our ability to quantify the economic
consequences of "too much, too soon" is far better than our ability to
quantify the impacts that might arise from "too little, too late" -- to
the extent that we cannot even define what this means! You appear to be
putting too much weight on the highly uncertain impacts side of the
equation. Worse than this, you have not even explained what the issues
are. In my judgment, you are behaving in an irresponsible way that does
you little credit. Furthermore, you have compounded your sin by actually
putting a lie into the mouths of innocents ("after carefully examining the
question of timing of emissions reductions, we find the arguments against
postponement to be more compelling"). People who endorse your letter will
NOT have "carefully examined" the issue.

When scientists color the science with their own PERSONAL views or make
categorical statements without presenting the evidence for such
statements, they have a clear responsibility to state that that is what
they are doing. You have failed to do so. Indeed, what you are doing is,
in my view, a form of dishonesty more subtle but no less egregious than
the statements made by the greenhouse skeptics, Michaels, Singer et al. I
find this extremely disturbing.

Tom Wigley


On Tue, 11 Nov 1997, Tim Mitchell wrote:

> Reference: Statement of European Climate Scientists on Actions to Protect
> Global Climate
>
> Dear Colleague,
>
> Attached at the end of this email is a Statement, the purpose of which is
> to bolster or increase governmental and public support for controls of
> emissions of greenhouse gases in European and other industrialised
> countries in the negotiations during the Kyoto Climate Conference in
> December 1997. The Statement was drafted by a number of prominent European
> scientists concerned with the climate issue, 11 of whom are listed after
> the Statement and who are acting as formal sponsors of the Statement.
>
> ***** The 11 formal sponsors are: *****
>
> Jan Goudriaan Hartmut Grassl Klaus Hasselmann Jill J

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