Right, but we're talking about -1 tonne (reducing emissions) vs -1 tonne (taking carbon out of the atmosphere) and last I checked, -1 tonne is equivalent to -1 tonne.

> Reducing current C02 levels is more difficult and expensive than just reducing C02 output, and has a greater impact on overall reduction

It makes sense to me that it's easier/cheaper to reduce C02 output (at least as long as there is lots of low-hanging fruit), but it doesn't make sense to me that one would have a greater impact than the other.