Moondust Concept

Earth must cool down. The climate is heating up, and positive feedback loops are kicking in. The habit of geoengineering with fossil fuels is not working for us, we need to geoengineer in the other direction.

To cool the Earth different approaches have been proposed. We could cool it by pumping up deep ocean water, which would also increase O2 generation at the surface. The usual reference is to sulfur powder release in the upper atmosphere, which would reflect sunlight. It would also be quite polluting and rain down on Earth like acid rain.

Maybe there is a less chemically or practically challenging way to reduce the amount of sunlight that reaches the Earth, and that is to rain moondust on it. We didn’t calculate but the idea of a giant dust blower on the moon appeals to us.. It would send dust in the general direction of Earth, then the dust would fall through the atmosphere and reflect sunlight. Once the cooling has allowed life to reabsorb enough CO2 the amount of dust can be reduced..


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