A,Worker control of production really worked great in Russia, China,etc didn't it?
B.What the Green Party proposes goes a long,long way beyond anything the Scandanavian countries have done or ever proposed. And in recent years even the Scandnavian countries have moved away from a command economy.
Your problem is you basically don't like the idea of a market economy,and want a command economy;ie the state decides what should be made,what price it should be at,etc. That has always proved to be a disaster.
The problem with the Green Party Utopia..Which sound an awful lot like the Venus project..is the same thing that dooms all Utopias:Human Nature.