I don't see this as being practical for general atmospheric C02 scrubbing, but would be awesome for space vehicles and submarines.
https://www.smithsonianmag.com/smart-news/this-new-yellow-powder-quickly-pulls-carbon-dioxide-from-the-air-and-researchers-say-theres-nothing-like-it-180985512/?
@feloneouscat Yeah that's my question. There's a lot of techniques for sequestering CO2, but they're all energy intensive.
There was one I remember that made baking soda, but no one is really going to use it for baking soda as you can mine that. Unless made required by law, it'd just be an extra cost attached to your production line.