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discuss the observational results. [Andrew Lacis] 9-314 A 11:47 11:47 Delete "the following" as redundant with "Section 9.5--there is no other section 9.5. Accepted. [Michael MacCracken] Confidential, Do Not Cite or Quote Chapter 9: Batch AB (11/16/05) Page 45 of 186

(This shows, in effect, that the change in global temperature can serve as a "medium of exchange" between different feedback effects, even though cloud formation is not directly a function of temperature.) [Andrew Lacis] 2-391 A 7:51 7:51 Hansen et al show that while the feedback efficiencies of the different feedback processes GISS is only one model.

concerning what the solar forcing was - this needs to be changed to a caveat ('though driven by solar forcing'). [Andrew Lacis] 6-1706 A 65:52 65:54 The sentence: "Since proxies indicate …possible amplifying mechanisms" seems reather Accepted technical for the expected readers.

What about volcanic RF which can be quite large for large eruptions on short time scales. What about asteroid impacts? [Andrew Lacis] 2-210 A 3:39 3:48 There is a very powerful message here that highlights the inexorable momentum of Noted human-induced climate warming.

low elevations, and may have ground up a lot of dirt (as the Malaspino glacier in Alaska does today) and hence may have been relatively dark (as the Malaspino glacier is). [Andrew Lacis] 6-1583 A 38:34 38:35 Box 6.3 says we don't know what caused the glacial to interglacial change in CO2 so it's Not accepted.

Since the global mean surface temperature of the Earth is approximately 288 K, the greenhouse strength of the Earth's atmosphere is about 33 K. [Andrew Lacis] 1-762 A 40:1 40:57 The strength of the atmospheric greenhouse effect is determined by the thermal opacity of Taken into account.

Idea discussed. Will empasize section. llghg section more though [Andrew Lacis] 2-381 A 7:43 line 43 ff Here or very close to here a reason should be given why radiative forcing needs Partailly accepted, text modifed to be known and why its uncertainty needs to be bounded.

Expert Review Comments on First-Order Draft (16 November 2005) IPCC Working Group I Fourth Assessment Report Page:line No. Batch From To Comment Notes constituents. [Andrew Lacis] 2-351 A 6:14 6:14 I thought volcanic aerosols only had a significant affect on stratospheric ozone in a high Taken into account.

(This shows, in effect, that the change in global temperature can serve as a "medium of exchange" between different feedback effects, even though cloud formation is not directly a function of temperature.) [Andrew Lacis] 8-759 A 52:37 53:11 Hansen et al. show that while the feedback efficiencies of the different feedback Noted: this point is, however, not processes can be compared in linear fashion, the feedback effects on the global surface discussed explicitly due to lack of temperature are multiplicative in nature and do not combine linearly.

[Philippe Tulkens] 2-2000 A 59:17 59:18 A fairly detailed description and analysis of the efficacy of different climate forcings is Noted presented by Hansen et al. (2005). [Andrew Lacis] 2-2001 A 59:17 59:56 The "efficacy" approach will likely prove to be a valuable diagnostic, but it almost Accepted - reworded guaranteed to be rather opaque to the non hard-core scientist reader or user.