All the geoengineering we might do is totally unproven and untested. If the alternative is a calamity then yes, of course we'll do it. As things stand, it seems

All the geoengineering we might do is totally unproven and untested. If the alternative is a calamity then yes, of course we'll do it. As things stand, it seems like we should be putting as much effort as we can into the thing we know works (reducing greenhouse gas emissions).