U.S. to Fund a $1.2 Billion Effort to Vacuum Greenhouse Gases From the Sky | Many scientists are skeptical of the technology, and environmentalists have criticized the approach.

The problem is there's a few hundred billion tonnes or so that needs removing and it can't go from 0 to billions of tonnes per year overnight, but as soon as you start doing it publicly propagandists will flock to it and use it to delay more effective and pressing action.

Considering it took eons to get the carbon into solid form from the last time it was in the atmosphere, that makes sense.