What if we pollute in that direction, instead of stopping the polluting?
You are correct this is called geoengineering and it is born of the hubris of humans thinking they should control the planet like a machine or something. The person you replied to I believe is appealing to other people who think Promethean action is irresponsible and instead we need to modify our relationship with the environment, by not continuing down the path we are on.
We are already geoengineering whether we like it or not. We just aren’t good at it, and we’re heating up the climate rapidly. Look at how much carbon dioxide we’ve put into the atmosphere. We don’t have a choice, doing nothing isn’t an option, hoping people stop being greedy is not an option.