One thing I find particularly concerning in these plans is how people want to use them. Lots of people inevitably suggest under these posts that we just use DAC as counterbalance instead of reducing emissions. This is very much impossible as optimistic reduction scenarios still need trillions annually from every country and a no-reduction scheme would lead to hundreds upon hundreds of trillions of global DAC funding, far more than the GDP of the Earth is right now. This is the scale of the megaproject we need to undertake.
The only way we can make these things viable is massive funding and incredible carbon emissions reduction. This is very literally the largest industrial project that ever has happened, a re-terraforming of our own planet. There is absolutely no way we are going to succeed without full effort from all countries.
Honestly I don't expect it to happen. It's depressing, but I just don't think humanity collectively can take action on a scale like this without direct personal incentives, and I don't think there are any. I think we're going to drown in our waste products like yeast in a fermentation tank due to the tragedy of the commons.
The only way we can make these things viable is massive funding and incredible carbon emissions reduction. This is very literally the largest industrial project that ever has happened, a re-terraforming of our own planet. There is absolutely no way we are going to succeed without full effort from all countries.
It's not terribly easy to overcome.