Sure but last time I checked infinity was quite a large number, so infinite growth requires infinite energy. We are not talking about "could things grow a bit

Sure but last time I checked infinity was quite a large number, so infinite growth requires infinite energy. We are not talking about "could things grow a bit more during my lifetime", we are talking about our systemic demand for infinite growth. In a capitalist system a society that manages its resources perfectly in a sustainable way has less potential for short term growth than one that just thinks about the next quarter.