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Testing geoengineering: a catch 22

Guest contribution by Mason Inman Governments are starting to take a look at geoengineering — planetary-scale projects to cool the planet. No longer in the realm of science fiction, this is something that many are calling to regulate — and soon. The technique that has geoengineering proponents most excited, and geoengineering critics most worried, are proposals to shoot sulphate aerosols into the stratosphere. These tiny particles, like those that large volcanoes spew into the air, can cool the planet. ‘Natural experiments’, such as the eruption of Mount Pinatubo in 1991, show that this works. At a hearing this month of 

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