The top 3 enemies of doing something about climate change are: fossil fuel megacorp PR and lobbying efforts (no surprise), mainstream media (little to no surprise) and environmental activists (fucking why).
We are fighting climate change not to feel good about ourselves, but to prevent those higher-degree impacts from happening in the first place.
What's worse is that climate change has a considerable momentum. If you resolve to hit +2C before taking climate action, then even stopping all GHG emissions instantly would leave you with another ~+1C that would trickle in over time. In reality, there is no fucking way to obliterate all GHG emissions overnight.
Geoengineering solves a lot, but it doesn't delete all of the problems outright. Unless you commit to some truly unhinged methods. Which might not be the worst idea, really - but then every problem we have with making geoengineering happen apples at least tenfold.
i'm not judging either way, i'm not a climate scientist and i have no opinion on the importance of ocean acidification, i just find it obnoxious when someone's asked to defend their position and they just say it again, but _harder_.