This is the problem with some of the geo-engineering approaches. We've shown that we can't really change how society and industry operate enough to reduce emissions, so what makes us think we can do the same for carbon capture? How do you actually get every farm to do this?
Don't take that too far: there is a lot of work to do. However we have a good idea what that work is we just need to apply it.
> Claus concludes, “Based on the Montreal Protocol and the decrease of anthropogenic ozone-depleting substances, scientists currently predict that the global ozone layer will reach its normal state again by around 2050.”
https://news.ycombinator.com/item?id=37949994
If I understand correctly then the ozone hole fluctuates with the seasons but on average it's still shrinking.
If someone finds a plausible way to reduce a major part of global greenhouse gases that costs merely, say, 10 or 100 billion, then that's something that a few major countries can do (and fund) unilaterally and doesn't need global consensus, unlike major emissions reductions which have the tragedy of commons problem where if you do that and other major emitters don't, then you've crippled your economy but haven't prevented any of the bad consequences.