Cloud Based Options

A range of options have been proposed to "whiten" clouds, or make them more reflective, by increasing the number of water droplets in the clouds. The most widely discussed proposal involves whitening low clouds over remote parts of the ocean by gravitational forces of the Earth and Sun are balanced by the centripetal force associated with that object's orbit of the Sun.

spraying a fine seawater spray in the air (Latham, 2002). This approach may be able to offset some or most of the radiative forcing associated with a doubling of atmospheric CO2 (Bower et al., 2006; Latham, 2002). Process understanding relevant to this approach (e.g., cloud physics) can be tested at relatively small scales (Salter et al., 2008), although such tests would not permit direct inference of climate consequences of large-scale deployment. Another proposed cloud-based approach involves the seeding of high cirrus clouds with heterogeneous ice nuclei to reduce their coverage, potentially using commercial airplanes (Mitchell and Finnegan, 2009). While this method is not technically an example of SRM, it could potentially increase the amount of longwave (infrared) radiation emitted to space, which would cool the Earth.

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