I'm sure those limits exist, but who's to say we'll ever hit those limits on human timescales?
right now, global warming is an existential threat that sets an upper bound on how much energy we can responsibly use. but if we can develop carbon-neutral means of harnessing energy at scale, we can use much more. if we can develop viable space travel, we can gain access to more material resources than exist on Earth. any one of the "next steps" along the exponential curve can fail, but I wouldn't assume we will hit a hard ceiling anytime soon.
right now, global warming is an existential threat that sets an upper bound on how much energy we can responsibly use. but if we can develop carbon-neutral means of harnessing energy at scale, we can use much more. if we can develop viable space travel, we can gain access to more material resources than exist on Earth. any one of the "next steps" along the exponential curve can fail, but I wouldn't assume we will hit a hard ceiling anytime soon.