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This is succinctly stated on Page 1-20 of the draft where it says, “The models are not completely comprehensive …”. [Richard S Courtney] 1-4 A 2:44 2:44 Replace “to reproduce” with “to emulate” because the models do not “reproduce” Accepted. anything. [Richard S Courtney] 1-5 A 2:45 2:48 Replace all of from “The remarkable success ..” to “… fortunately impossible on the Taken into account.

[Richard S Courtney] 2-18 A 6:22 6:22 Replace the words, “However, unlike RF, it” with “It” because it is not correct to assert We do not assert this.

misleading because, for example, atmospheric CO2 concentration is known to have risen and, therefore, it would be surprising if its contribution to the radiative greenhouse effect had not risen, but that does not of itself indicate that the total greenhouse effect has increased. [Richard S Courtney] 2-51 A 24:15 24:16 After “… Tegen et al., 1996)” it is essential to insert an additional paragraph reporting the Do not agree with suggeted text.

[Richard S Courtney] 1-38 A 14:44 14:44 To avoid being completely misleading, after “progress.” it is important to add: Rejected. The assertions are not “This research has great importance because present understandings as exemplified by correct.

Batch From To Comment Notes that this be done because it seems the authors of this chapter are ignorant of the warming effect of sulphate aerosols combined with soot particles. [Richard S Courtney] 2-20 A 6:31 6:32 There is a need to check if the +0.55 Wm-2 RF of sulphate aerosols combined with soot Paper will be cited particles (ref.

American Journal of Botany, 90, pp 610-619 (2003), Wagner F et al. Science vol. 284 p 92 (1999)). ) [Richard S Courtney] 2-27 A 8:51 8:51 After the phrase “about 19 ppm” appropriate context requires addition of the following Rejected statement; “which compares to the Northern Hemisphere seasonal variation (decrease and increase) of about 14 ppm during each year.” [Richard S Courtney] 2-28 A 9:15 9:15 After the phrase “reached by 2010” it is very important to insert the following paragraphs Do not agree.

Jacobson MZ, Nature, vol. 409, 695-697 (2000)),. [Richard S Courtney] Confidential, Do Not Cite or Quote Chapter 2: Batch AB (11/16/05) Page 366 of 386

International Journal of Climatology, vol. 23, 829-845 (2003)) [Richard S Courtney] 2-63 A 45:1 45:2 Delete “, with a slight possibility of a positive RF, although very unlikely” because if the Text refers to Myhre et al.

Batch From To Comment Notes al. 2005) (ref. Rorsch A, Thoenes D and Courtney RS, (E&E v10 no2 (2005)). [Richard S Courtney] 2-30 A 10:15 10:18 Delete everything from “the combustion of cement production …” to “… biomass Rejected.

The model predictions can only indicate the confidence that can be applied to the understandings built into the models because agreement of those predictions with empirical data obtained from the real climate system can provide confidence that those understandings are correct. Richard S Courtney (exp.) [Richard S Courtney] 2-3 A 3:21 3:21 Delete the sentence, “There is also some confidence … realistic climate change Do not agree with argument mechanisms” because this sentence in the draft title is simply not true.