Warning: This Chapter Needs to Be Read in Conjunction with the List of Accepted Changes in the Underlying Report (document IPCC WGIII: 9 Th /doc 3 (4.V.20007), Available from the Working Group III Website (www.mnp.nl/ipcc/index.html). This is a Pre-Copyedit Version of the Chapter. Text, Tables and Figures Are Subject to Checking and Copy-Editing.