The irony is that it's ridiculous to try to claim degrowth is in any way sustainable.
Its obviously not, and it's obviously not life, to try to clain that it is, especially based on unsound theory of greenhouse gases in an adiabatic atmosphere, and/or abuse of proven thermodynamics theory.
You miss the real culprit causing all the now unnecessary planetary damage being done by alll forms of energy extraction done to the planet, all for profit, a fully unsustainable and actually dishonest energy lie.
Its profit that has to stop, to enable real forever sustainable growth, actually far more growth, far more life than we ever saw previously.
Its either that or extinction.
You seem to choose the latter.