> It has an essentially limitless supply of carbon, oxygen, nitrogen, and sulfur available to it.

Are you able to provide a rough summary of how the quantities of these materials compare with the quantities available on earth?

It wasn't that long ago that humans spoke about things like the number of fish in the sea, the ability of the earth's atmosphere to absorb waste gases etc as being effectively infinite until we eventually discovered that this was unfortunately not true. It is just something that pops into my head whenever the word unlimited, infinite or limitless get used when talking about energy, resources and so on.