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geoengineering options, and (5) exercising international leadership. The recommended options in each category are described in Chapter 9.

General Conclusions

In conducting this study, the panel first established the approach and framework described in Chapter 4. The information and data summarized in Chapters 5 and 6 were then gathered and analyzed. On this basis, the Synthesis Panel reached the collective judgment that the United States should undertake not only several actions that satisfy multiple goals but also several whose costs are justified mainly by countering or adapting to greenhouse warming. The panel believes that a systematic implementation of the complete set of low-cost options described in Chapter 9 is appropriate. The panel concludes that options requiring great expenses are not justified at this time.

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