Look at what happened with the Canadian protests and banking restrictions.
Many are concerned that cdbc will allow the gov to create carbon rations that are enforced by disallowing purchases. Cash is fungible while regulated digital currency isn't.
But how could something like a carbon ration possibly be implemented? They'd have to retrofit every PoS system in the nation to classify sales and tag payments with that information. This would already be possible using the existing settlement infrastructure, nothing unique to how a CBDC would work.
Plus, if the goal is to limit carbon emissioms, it's more of a liberal market-shaping attitude that mainstream economists have to simply tax carbon heavy activities rather than invent new and unpopular technological measures to force it to happen. Same applies to the fears about limiting meat consumption, etc.
Something along the lines of ‘We face a climate emergency that is even more serious than the Covid emergency, we have to do this, this is about saving lives’?
(I’m not in any way a climate denier, just a huge pessimist when it comes to attempted solutions)