Planetary liposuction
Monbiot stole my analogy. I have had a post drafted for the last couple of months based on the idea that geoengineering attempts to rapidly modify the climate with techno-fixes are the equivalent of liposuction for an obese planet, retrospective attempts to undo slowly accumulated damage overnight that may bring temporary cosmetic improvements (and perhaps mild benefits of more valuable kinds) at significant risk of their own.
I intend to say quite a bit more about geoeingeering, as I suspect that it is not going to go away, but will only become more significant in and ethical and political debates about climate change. This is another topic that Christian ethicists will need to contemplate, and once again, there are no shortcuts to learning about the details of the various proposals, which range from putting millions of tiny mirrors in space to reflect a small amount of incoming sunlight, to seeding the ocean with iron filings to generate algal blooms that soak up carbon dioxide and fall to the ocean floor, to adding sulphur to aviation fuel (a substance that we've been trying to get out of the atmosphere for other reasons for some time) to reduce solar radiation entering the atmosphere, to crushing certain kinds of rock into powder and scattering them on the ground to accelerate a natural carbon sink (this last proposal may have some merit, by the way).