> Someone willing to extract CO2 from the air and store it in some rock forever can indeed offset some carbon you emitted.

Except that doing so requires more energy than you got out of the process which created the CO2 in the first place.

The only way to mitigate climate change is to keep CO2, in the form of Hydrocarbons, in the ground in the first place.

If we have any hope at averting the worst case scenario we would be start globally marking proven reserves as "never to be extracted". As it stands we are on course to release all of the CO2 stored in currently leaded fossil fuel reserves. We can slow that process down a bit by regulation, but it will matter on the scales we're working with.