A lot of otherwise-reasonable climate researchers seem to have an unduly negative view of potential direct interventions in the climate, and for good reason. Scientists know that theory and practice often are very different. You can't 'experiment' with global scale geo-engineering.

To put it in HN terms: you're deploying untested code for a global scale life support system written by a first-project-junior in an experimental new technology stack directly to production without having a test or staging environment, and there are no backups.

We may well be forced into geoengineering. Because, by the time enough people/firms/governments are sufficiently motivated, it'll be too late for anything else. Except adapting, I mean. But anyway, CO2 capture is the obviously safest bet. Adding shitloads of iron to the oceans, or injecting shitloads of SOx into the stratosphere, are just a little too likely to have serious downsides. Or putting screens at L1, for that matter.

How can you tell that they didn't seriously consider your favorite argument? Usually geoengineering is not a direct part of the science of measuring climate change.