10bn tonnes must be captured from the air every year to limit global heating to 1.7C, says Johan Rockström
Problem is this part:
To achieve this through technological means, such as direct air capture, would require the construction of the world’s second biggest industry, after oil and gas, and require expenditures of about a trillion dollars a year, scientists said. It would need to be done alongside much more drastic emissions cuts and could also have unintended consequences.
That makes it incredibly unlikely that this kind of removal will be done.
Alternative options exist to limit the heating while still increasing carbon. Nuclear winter!
SAI would also be a slightly less violent alternative option to that. Its not a good solution but it might be what we are left with because we can’t agree to do anything else that would have helped.