"All scientists say you should give us all power over every aspect of the economy in order to save the world" is not very far away from, "We deserve all power over every aspect of the economy, because we act on behalf of the workers and you do not". I used to wonder why greenies were so obsessed with this too to the exclusion of far more pressing issues like direct pollution, but once you line it up with the socialist cause it stops being mysterious at all. Just more lusting over centralized authoritarian power.