It achieves global climate equilibrium while being small scale and reversible.
Shaw ’20 [Jonathan; December 2020; Managing Editor at Harvard Magazine, citing Dan Schrag, Director of the Harvard University Center for the Environment; Harvard Magazine, “Controlling the Global Thermostat,” https://www.harvardmagazine.com/2020/11/features-controlling-global-thermostat]
The aim of solar geoengineering would be to keep Earth’s temperature as close to equilibrium as possible says Peter Huybers, a professor of earth and planetary sciences and of environmental science and engineering. “That’s what we know best.” And from an engineering perspective, he suspects such action could do more good than harm—“at least if you’re smart about it, start out very small, and proceed in a reversible way.” Keith’s modeling also suggests that if the process were used to halve warming, that would moderate climate hazards nearly everywhere. Only 1.3 percent of land areas would see a change in water availability—as increased moisture, not as drought. In addition to attenuating global average temperature, this halving of warming would in theory lessen the intensity of tropical cyclones, reduce regional changes in water availability, ease extreme precipitation and extreme temperatures, and even reduce atmospheric carbon concentrations and ocean acidification.