Capturing carbon at the point of emission (e.g the exhaust stream from CCGT plants) seems orders of magnitude more important than any attempt to remove atmosphe

Capturing carbon at the point of emission (e.g the exhaust stream from CCGT plants) seems orders of magnitude more important than any attempt to remove atmospheric carbon. In the atmosphere CO2 is at 400 parts per million. That's a lot of irrelevant gasses to move around a process to capture a very dilute component. It's the same reason why people reassuringly pointing to the amount of Thorium or Lithium in the ocean isn't useful.