The article mentions that the plan doesn't include a carbon tax, and that one of Sanders' advisors says we need "more than just a carbon tax", and then gives a

The article mentions that the plan doesn't include a carbon tax, and that one of Sanders' advisors says we need "more than just a carbon tax", and then gives a favorable quote from that advisor. I can understand why a carbon tax might not be _enough_ given the current state of affairs, but is there a good argument against including it in a comprehensive plan other than that people dislike the idea of new taxes?