A number of different SRM methods have been proposed. This subsection briefly outlines some of the approaches that have been discussed in the literature (Keith, 2000; Rasch et al., 2008) and briefly summarizes their potential to reduce total radiative forcing. Other sources, including a recent report by the Royal Society (2009), provide a more comprehensive description. The relative advantages and disadvantages, potential for unintended consequences, and governance and ethical issues associated with these approaches are discussed in the next subsection. It should be noted that, unlike many other areas of research discussed in this report, these issues have undergone relatively little scientific scrutiny, with most of the relevant research done by a few small groups of scientists working with limited resources. Thus, many of the conclusions presented here must be regarded as preliminary and subject to revision.
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