When I state that people must capture their emissions - I mean precisely that, as a simple matter of mathematics, the matter released must be captured and seque

When I state that people must capture their emissions - I mean precisely that, as a simple matter of mathematics, the matter released must be captured and sequestered. Offsetting is a different matter entirely and is more of a transitionary exercise, because we ultimately need to hit net zero, for which offsetting is not a solution. The mechanics of either of those are done are left as an exercise for the reader. On geological timescales all of this stuff is quite hard. For example, you could populate massive forests, fell the trees and just stack up massive piles of wood. Assuming all of that is net carbon negative - what if there's a massive fire in the next thousand years? Oops.