We should get used to the idea of climate engineering, also known as geoengineering, the large-scale manipulation of the Earth's climate. This is because it's possible that, eventually, the risks of climate engineering will be smaller than what's already happening.
When we try to predict what will happen to us, there are so many uncertainties that it's not clear how bad things will get, or how fast it will happen. But it's possible that we will have rapid sea level rise, crop failure, famine and other apocalyptic scenarios. The risk of trying to cool the earth with some technological fix will likely be less, at that point, than those disasters.
It seems frightening to do this, but it's a lot less frightening than the alternatives. In fact, already we are engineering the climate, with our CO2 emissions. We're just doing it thoughtlessly. We need to pay attention to what we're doing and clean up after ourselves.
We can call climate engineering "unnatural", but that's a word that's not too useful these days. There is no separation between us and nature. We have thoroughly dominated it. So we have to adjust nature. It's like a big garden. We have to do what's necessary to keep things growing.
We can call the manipulation of our environment dangerous, but we already do it, including work to mitigate the damage we do. Now what has to be done is on a global scale. It's just a change of magnitude.
A long time ago, God told Noah, "Go forth and multiply, and subdue the earth." I think we've subdued the earth at this point. Now what? It's time to take global responsibility for our mess.