I'd challenge the idea that this is unsustainable because of the specific system. Entropy and resource limits mean whatever we do is unsustainable under any system as far as we tell, both theoretically and in practical timespans. Nobody seems to have an argument for where the physical resources will come from, or how we deal with exponential population growth without just having regular famines (even worse than losin…
Growth is not inherently good, uncontrolled growth is certainly not.