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

Chapter-
Comment
SPM-
120
SPM-
573
SPM-
574
SPM-
575
SPM-
576
para
Batch
From Page
From Line
To Page
To line
Comments
IPCC WGIII Fourth Assessment Report, Second Order Draft
7 B 8 3 8 4 Clarify that the costs being referred to are global totals. Costs in
different countries may indeed be lower if they do not participate.
U.S. Government
(Government of U.S. Department of State)
7 A 8 4 8 6 Insert super script reference to footnote 5 at **first** mention of
GDP losses in line 5, not at the second reference in line 6, as
presently. Note 5 is one of the most important lines in the entire
SPM and probably deserves promotion from a footnote.
(Pat Finnegan, Grian)
7 A 8 4 8 8 Negative GDP losses due to GHG emission reductions are peculiar
and cannot generally accepted. The model showing the negative
GDP losses presumes a mechanism that the larger carbon tax is
imposed, the larger investments may take place by the revenue
obtained through the carbon tax, and then employment increase and
GDP increase will follow. In reality the carbon tax will work to
diminish economic activities because of the higher energy prices,
and GDP in total will be decreased. However, the model does not
consider these effects. The model presumptions could be justified
for short time periods; however, for a long time span such as up to
2050 and 2100, the presumed mechanism can never be justified.
For these reasons, I strongly recommend you to delete the negative
values in Figure SPM 5 and the related words. If not, you should at
least provide with description regarding the limitations of the
model. Otherwise, IPCC will confuse and mislead readers. (the
same comments to Figure TS 15a and Figure 3.29a)
(Keigo Akimoto, Research Institute of Innovative Technology for
the Earth (RITE))
7 A 8 4 8 4 explain that "level of participation" means the number of Parties or
countries which are participating.
(Rachel Warren, University of East Anglia)
7 A 8 4 8 4 Is there not the case where higher baseline emissions, if associated
with inefficiencies, can actually mean some lower cost reduction
potentials?
Expert Review of Second-Order-Draft
Confidential, Do Not Cite or Quote
Response suggested by cochairs
price of allowances
ACC
ACC
DISCUSS if studies that show
negative costs are sufficiently
comparable to be included; if
the studies can be included
provide an explanation for their
results in the caption
ACC; add explanation
Action
for
chapter
Considerations
by the writing
team
3 accepted. Figure
to be revised.
(3), but
retaining
negative costs
DISCUSS 3 Rejected. While
theoretically
possible, no
Page 149 of 348