In this article I maintain that a progressive and leftist carbon tax should be revenue-neutral through a dual policy package: first, it should use some revenues to offset price increases for the poor and middle classes; second, it should use the remaining part of revenues to lower taxes on labour income (both employed and self-employed income) for those below a middle-income threshold. I will briefly examine three reasons why such a revenue-neutral and dual-package carbon tax (RN-DP-CT) could (and should) become central in the political agenda of the European Left – even though much of what I will suggest can reasonably hold also with respect to other countries. First, the tax wage on labour in the euro area is one of the highest in the wor...