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

Chapter-
Comment
para
Batch
From Page
From Line
To Page
To line
Comments
IPCC WGIII Fourth Assessment Report, Second Order Draft
137 (Jean-Pascal van YPERSELE, Université catholique de Louvain
(Belgium))
SPM- 8 A 8 20 8 21 But practically no studies have been done which actually do this,
624
and there's absolutely no agreement as to what the rate of decline
should be.
(,)
SPM- 8 A 8 20 8 21 I did not find justification for this last sentence when I did a search
625
in Chapter 3. Suggest deleting last sentence on declining discout
rates.
(Haroon Kheshgi, ExxonMobil Research and Engineering
Company)
SPM- 8 A 8 20 8 20 edit bullet to read "comparing mitigation costs with the monetised
626
benefits of ...." (i.e. insert "monetized"). Add after "policies",
"Nevertheless it is clear that the lower the stabilisation level, the
lower the damages due to climate change in both market and nonmarket
sectors in all world regions, the lower the risk of abupt
changes in the earth system and the less the need for (and hence
costs of) adaptation in human systems. Hence higher mitigation
costs are offset by lower adaptation costs. Consideration of cobenefits
of mitigation policies generally offset mitigation costs (see
C12).
(Rachel Warren, University of East Anglia)
SPM- 8 A 8 20 8 20 Add new bullet which reads in bold (with text taken from WG3 Ch
627
3 which on which I am an author) "Stabilisation at 450 ppm CO2
equivalent would be likely to limit impacts to those associated with
temperature rises of 0-2 degrees above 1990" (or convert to
whatever baseline is decided upon) and avoid those listed (WG2 Ch
19) as occurring for temperature rise of 2-4 degrees above 1990
(see Table SPM1). Hence, referring to WG2 Ch 19, examples of
resultant avoided climate change damage include that the risk of a
decline in food production would be limited to low latitudes (0-2C)
as opposed to being global (2-4C); the risk of widespread or
complete deglaciation of the Greenland Ice Sheet would be
lowered; drought and forest fires would be much less widespread;
Expert Review of Second-Order-Draft
Confidential, Do Not Cite or Quote
Response suggested by cochairs
See A-612
REJ; is in chapter 2;
ACC to add reference to
respective section
See A-612
See A-612
DISCUSS possibility of adding
table; problem is large WG II
overlap
Action
for
chapter
Considerations
by the writing
team
Page 161 of 348