Our model of a postcapitalist set of political/economic systems is designed first to address the void of classic marxist discussions of socialism/communism in a void. It is not enough any more to call yourself a socialist waving a flag with that semantic phantom still to this day claimed by North Korea and China, and now by social democratic reformists.
To that core model we then bring the ideas of ecological socialism as a larger dimension of that set of specifications. The potential conflict of ecological and working class issues needs a careful analysis and resolution (not necessarily hard to do).
The longer postcapitalism is delayed the more difficult the remedy and we should really have had a transition to a new system almost at the start of the false dawn of the pseudo-epoch of capitalism. As things stand now the totalitarian domination of capitalism is destined to planetary catastrophe.