Geoengineering schemes have been proposed to temporarily counteract global warming, as nations work to implement preferred mitigation strategies - namely, reductions in greenhouse gas emissions. While many general geoengineering concepts have been put forward in recent years, no concrete proposals that address the range of scientific and social issues related to such activities have been submitted for consideration. This session focuses on climate modification through the manipulation of solar energy input to Earth via processes internal or external to the atmosphere. Several specific schemes along these lines have been investigated in a preliminary way in terms of basic processes. Examples include the injection of reflective aerosols into the lower stratosphere, seeding of marine clouds to modify their albedo, and placement of mirrors beyond the atmosphere to deflect incoming sunlight. However, it is now desirable to ask more detailed questions regarding implementation and expected outcomes. Accordingly, this session invites papers describing the most recent scientific and engineering results on solar radiation control strategies. Particularly sought are papers describing the feasibility, risks, costs, policy implications, and ethical and political dimensions of global radiation intervention, but only if the analyses are developed on the basis of sound scientific findings. While proposed engineering projects may assume regional or global scales, all of the local, regional and worldwide impacts are open to consideration, including predictions of changes in climatological, biological, and social parameters. Presentations of well-developed designs for laboratory or field experiments relevant to the topics outlined above are also welcome.