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How much it costs to cut 1 metric ton of carbon emission with various methods for different global carbon emission levels
(www.edf.org)
This great graph came to my attention from this video from vlogbrothers. It also has some good explanations of what it means.
Note that carbon capture doesn't really make sense till you've exhausted all the other emission minimizing methods.
Source: https://www.edf.org/revamped-cost-curve-reaching-net-zero-emissions
I wonder why forestation is not present in this chart, as it is a low-cost carbon capture with side benefits. Sure, it is hard to scale, but reducing current deforestation rates would be a big step.