Back then, it was just theoretical reasoning, but because of finite resources it will become a necessity in the near future.
虽然这在当时只是一个理论，但是由于我们的资源是有限的，这个概念会在不久的将来展现其必要性。
Back then, it was just theoretical reasoning, but because of finite resources it will become a necessity in the near future.
虽然这在当时只是一个理论，但是由于我们的资源是有限的，这个概念会在不久的将来展现其必要性。
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