Finally, there have been various geoengineering approaches suggested that could potentially slow warming until new energy technologies are developed and deployed. These options involve intentional, direct manipulation of the earth's energy balance through interventions at the planetary scale. For example, Wigley  suggested simulating volcanoes, which are known to cool the planet after high altitude eruptions, by purposely emitting large quantities of sulfate particles into the stratosphere. The objective would be to reflect incoming solar radiation. Such approaches are early in their conceptualization and would have to be carefully evaluated for their economic and environmental impacts.
Note that Chap. 9, Geoengineering: Direct Mitigation of Climate Warming, provides an overview of the more widely discussed project proposals, and highlights the critical uncertainties.
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