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

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IPCC WGIII Fourth Assessment Report, Second Order Draft
limited.” For example, such studies may presume perfectly
efficient policies (i.e., global reduction at the lowest marginal cost).
[NOTE TO TPCC review team:It is recommended that a USG
economist looks at this paragraph closely. This statement is
essentially saying that peaking global emissions in the next 20
years will have limited impacts on annual GDP growth. This
statement appears counterintuitive. END NOTE] The use of the
terms “low cost” and “limited” ane inappropriate value judgements
and the authors should rephrase the sentence. U.S. Government
(Government of U.S. Department of State)
A 9 5 9 5 To help readers make the most of the SPM, it might be helpful to
end this sentence with "… government policies as described in
Section D". Otherwise readers might be left with the question "yes,
but what policies?"
(Andy Reisinger, TSU IPCC Synthesis Report)
A 9 5 9 5 Add "and efforts from multi-communities"
(Government of China Meteorological Administration)
9 A 9 7 11 16 The first three sentences of this paragraph need to be redrafted as
they present a misleading picture as to the certainty of the costs
estimates and economic potential for mitigation of Greenhouse
gases by 2030. The figures are also presented without the
significant caveats that surround the bottom-up estimate of Table
11.3. The authors of the SPM need to ensure that the context that
the discussion of the economic potential for mitigation, is clear and
should not imply that the challenge to reduce greenhouse gas
emissions is an easy one.
(Government of Australia)
9 A 9 7 9 12 Suggest that the following text replaces the first three sentences
(this text is derived from Section 11.3 and the Technical Summary):
"Table SPM 2 provides a rough, bottom-up estimate of the potential
for mitigation of greenhouse gases in 2030. The table illustrates that
in 2030, between 8-12 GtCO2-eq could be mitigated at costs
Expert Review of Second-Order-Draft
Confidential, Do Not Cite or Quote
Response suggested by cochairs
Action
for
chapter
Considerations
by the writing
team
(11)
ACC ACC
(11)
UNCLEAR Request
clarification.
(11)
REJ; caveats are given in para 9
(can also be strengthened in
table 2 )
Caveats to be strengthened in
table and text.
TIA when merging section C
header with para 9
Caveats still to
be discussed.
(11)
Useful text to be
considered.
Revise
penultimate
sentence to say
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