An element that I don't understand about the carbon sequestration push is that water vapor is a more potent greenhouse gas than CO2, yet nobody sees condensation of water vapor out of the atmosphere as a strategy. It has the side benefit of its "waste product" being pure water, which would be a huge benefit for arable regions lacking only water (like East of the Rockies in the USA, Australia, the Middle East / North Africa, etc.)

The only such use I see is small-scale, localized cloud seeding over watersheds.