11-09-2017, 04:42 AM
There are greenhouse gases stronger than either CO2 or methane; CFCs come to mind, but they are undesirable for other reasons. I suppose something like HCFCs (hydrochlorofluorocarbons) which are rather more stable might work. Apparently, sulfur hexafluoride SF6 is very good at absorbing IR light but it's such a heavy gas that mixing it into the atmosphere would be problematic.
Of course, large amounts of any of these in the atmosphere would be a mammoth, and continuing, industrial project. Nothing in Earthly life metabolises them, so one would be stuck with factories.
Of course, large amounts of any of these in the atmosphere would be a mammoth, and continuing, industrial project. Nothing in Earthly life metabolises them, so one would be stuck with factories.