Solar Radiation Management (SRM) is one of the two main forms of geo-engineering, and refers to technologies that aim to combat global warming by reflecting a small percentage of the sun's energy back into space.
Proposed SRM projects include artificially seeding clouds to reflect energy back in to space and launching orbiting solar mirrors.
Critics claim such proposals are unproven, distract from the urgent need to reduce carbon emissions, and would fail to address the ocean acidification that results from increased concentrations of carbon dioxide in the atmosphere.
However, a 2009 report from the Royal Society warned that geo-engineering techniques could represent the only way of curbing dangerous levels of climate change and as a result investment in R&D should be increased.
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