Carbon sequestration is done so much more effeciently by biological processes then by machines and chemicals. Just eliminating the millions of hectares of prescribed burning of grassland and savanahs on this planet and instead treating those areas with prescribed high density grazings would sequester millions of tons of carbon every single year into those soils. This would start numerous beneficial processes such as increasing water infiltration and water holding capacity of these soils. It would reduce evaporation rates as well and so increase the amount of living organizims per hectare.
Pie in the sky? Not at all. There are now more than 1 million hectares being managed holistically. https://holisticmanagement.org/