This blog post, The impact of direct air carbon capture on climate change, by Michael Nielsen is a good read, and contains some insight that puts some of my own feelings into words.

This quote in particular stands out to me (emphasis mine)

Still, it’s helpful to have a ballpark figure to aim for. If DAC is scalable at $100 per tonne, it starts to get very interesting. And at $10 per tonne, the costs start to resemble things we’ve done before for environmental concerns.
As we’ll see in a moment, the $100 cost estimate is at least plausible with near-future technology. $10 per tonne is more speculative, but worth thinking about.
What I like and find striking about this frame is that many people are extremely pessimistic about climate change. They can’t imagine any solution – often, they become mesmerized by what appears to be an insoluble collective action problem – and fall into fatalistic despair. This direct air capture frame provides a way of thinking that is at least plausibly feasible. In particular, the $10 per tonne price point is striking. The Clean Air Act was contentious and required a lot of political will. But the US did it, and many other countries have implemented similar legislation. It’s a specific, concrete goal worth thinking hard about.

One other thing I’d like to call out about this post that I really liked is the extent to which it’s a work of rough notes and speculation, but quantified. It’s about exploring a space and getting a feeling for the parameters for the discussion, which is in my opinion really valuable.