The social metabolism of our capitalist industrial economies is strictly unsustainable. Post-growth now constitutes the essential horizon of our time. We must imagine other forms of economy – or rather, we must finally apply the knowledge that we already have, and that a series of actors in our societies persist in ignoring or distorting. Short-term opportunism and the structural injustice of extractive capitalism combine with existential fears of finitude and death to keep our political and economic elites, but also the majority of citizens, in denial of the necessities of life. the decrease. Based on the approach based on socio-ecological metabolisms, and in particular invoking the imagination of the “solarpunk” movement while drawing inspiration from the socio-economic implications of “terror management theory”, we will reflect on the obstacles and fears which currently block the ecological transition and we will explore ways out of these blockages.