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

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Chapter-<br />

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<strong>Comments</strong><br />

IPCC WGIII Fourth Assessment Report, Se<strong>co</strong>nd Order Draft<br />

<strong>co</strong>ncentration levels. The authors should potentially clarify the<br />

statement of B.5. The key point is that is that emissions must peak<br />

and decline to meet any long-term <strong>co</strong>ncentration level and that the<br />

lower the level the more quickly this peak and decline must occur.<br />

The discussion <strong>co</strong>uld be improved to provide greater clarity, more<br />

information, more linkage to the material in Table <strong>SPM</strong>.1, and<br />

more <strong>co</strong>ntext within which to interpret the information (e.g., why<br />

450 ppmv, overshoot issues). U.S. Government<br />

(Government of U.S. Department of State)<br />

B 5 4 5 5 Clarify. Sentence is unclear. “For achieving … should lead to<br />

peaking” is awkward/<strong>co</strong>nfusing. U.S. Government<br />

(Government of U.S. Department of State)<br />

B 5 4 5 5 Clarify. Sentence is unclear. “For achieving … should lead to<br />

peaking” is awkward/<strong>co</strong>nfusing. U.S. Government<br />

(Government of U.S. Department of State)<br />

B 5 4 0 0 “…implemented…When? Timeframe?” The authors should<br />

potentially clarify the statement of B.5. The key point is that is that<br />

emissions must peak and decline to meet any long-term<br />

<strong>co</strong>ncentration level and that the lower the level the more quickly<br />

this peak and decline must occur. The discussion <strong>co</strong>uld be<br />

improved to provide greater clarity, more information, more linkage<br />

to the material in Table <strong>SPM</strong>.1, and more <strong>co</strong>ntext within which to<br />

interpret the information (e.g., why 450 ppmv, overshoot issues).<br />

U.S. Government<br />

(Government of U.S. Department of State)<br />

A 5 5 0 6 specify what uncertainty is meant here: uncertainty about the <strong>co</strong>sts,<br />

uncertainty about the likelyhood to reach the stabilisation level<br />

(Ronald Hutjes, Alterra)<br />

Expert Review of Se<strong>co</strong>nd-Order-Draft<br />

Confidential, Do Not Cite or Quote<br />

Response suggested by <strong>co</strong><strong>chair</strong>s<br />

merging with para 6<br />

TIA; heading text to be deleted,<br />

but wording to be used for<br />

merging with para 6<br />

TIA; heading text to be deleted,<br />

but wording to be used for<br />

merging with para 6<br />

TIA; heading text to be deleted,<br />

but wording to be used for<br />

merging with para 6<br />

TIA; heading text to be deleted,<br />

but wording to be <strong>co</strong>nsidered for<br />

para 7<br />

Action<br />

for<br />

chapter<br />

Considerations<br />

by the writing<br />

team<br />

Page 93 of 348

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