I agree that the only question left is how much consumption we can allow. Consumption follows from income. There is a way that we could limit income justly (as we in the West think of justice). What the allowable income can be is debatable, but the point is that a limit on consumption can be achieved justly.

if curious: "To Preserve What We Have, What We Have Must Be Enough" (here in Medium, but not behind the paywall)