Re: There will be a need for Carbon stuff in the Economy
If we're talking about keeping all the carbon in the ground, then the energy we use has to come from somewhere. This - http://www.withouthotair.com - is a very good analysis of the options. Worstall's slim volume, 'Chasing Rainbows' is worth a read too. Unless we all go back to pre-industrial-revolution energy use with all that entails in terms of reduced population, disease, starvation et al.
Personally I don't see certain forms of carbon use disappearing at all. If we carry on flying then kerosene is going to be very hard to replace. I don't see the energy density of hydrogen or electrical energy storage approaching kero any time soon if ever. Same thing for container ships & bunker oil/diesel. Plenty of people have tried to build upscaled sailing ships but we don't see them around in more than prototypes.
Of course we could make kero/diesel from atmospheric CO2 but that needs a lot of hectares of sunshine, even if we have an optimised natural or artificial photosynthesis process - see the ref above.