Nature isn't confined to the earth. Nature is nature, all that is. We are inside it, and can never be outside of it. The earth is just a little clump of chemicals in the grand scheme of it. The entire system is nature. All the energy of the big bang is still equal to 1.
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Ah, I see.
If the universe is still expanding (expanding into what?) is more energy being created?
I guess if there is only one universe and it isn't going to crash into another expanding one, then the energy gets spread wider. Eventually, I guess it will contract again?