With a sufficiently low and stable population, of, say, 50 million, renewable resources, such as water, wood, nitrogen, and fertilizer could be reused indefinit

With a sufficiently low and stable population, of, say, 50 million, renewable resources, such as water, wood, nitrogen, and fertilizer could be reused indefinitely. But non renewable resources, like oil, natural gas, and metals will eventually become permanently extinct, like oil and natural gas, or will have to be recycled in perpetuity, like metals. This is what awaits us sooner or later anyway.