SODBatch A&B SPM Comments co-chair response final ... - ipcc-wg3

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Comments
IPCC WGIII Fourth Assessment Report, Second Order Draft
7 A 8 0 8 0
models should be added.
(Government of Japan)
footnote 5: when the end-loss is compared to an average annual
rate, does one not have to specify the period over which the average
is spread?
(Aviel VERBRUGGEN, University of Antwerp)
7
F
5
6
F
4
6
F
4
A 8 0 8 0 Figure SPM.5: the label on the abscissa should be more complete as
"Radiative forcing stabilization level (W/m²)"; the label on the
ordinate perhaps as "Mitigation costs as a % of global GDP in
2050"?
(Aviel VERBRUGGEN, University of Antwerp)
A 8 1 0 0 SPM.4 figure legend repeats information already included in an
inset within the figure. Therefore, sentence "Black bars reduction...,
grey bars .." can be deleted.
(Government of Spain)
B 8 1 8 1 … reductions : which baseline is used ?
(Jean-Pascal van YPERSELE, Université catholique de Louvain
(Belgium))
7 A 8 3 8 8 p. 8, lines 3-8 and n 5; and p.11, lines 19-23 and n 9 --- The
stabilization costs indicated in the SPM are (highly) suspect
because they are assessed against baselines that already include
large reductions in emissions attributable to technological change,
the adoption of which has not been considered in the mitigation
cost analysis (or has simply been treated as involving zero cost).
Moreover, many cost estimates are based on models that assume a
carbon-free “backstop” energy technology(ies) that may (does) not
yet exist, a technology that is often identified as “generic”. The
“backstop” technology assumption can substantially reduce
mitigation costs.
(Christopher Green, McGill University)
Expert Review of Second-Order-Draft
Confidential, Do Not Cite or Quote
Response suggested by cochairs
ACC; modify footnote; we will
also add the annual rate
reduction in brackets in the
main text
TIA; we will drop W/m2 and
replace with conc
Action
for
chapter
Considerations
by the writing
team
ACC; modify
footnote; we
will also add the
annual rate
reduction in
brackets in the
main text
(4)
Accepted.
Figure will be
modified.
(4)
TIA Accepted.
Figure will be
modified.
ACC; add info to caption ACC; add info
to caption
REJ; they are calculated indeed
against ( a wide range of)
baselines, but that is standard
practice
(4)
(4)
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