What I say holds even with the opposite scenario for the earth. Say the earth at the end of the Universe becomes a nearly zero Kelvin lump of rock in space, with that coal we put on the fire unburned because we weren't there. Because that energy cannot be used to do work, there is still zero entropy. We made no difference. This is only an aside anyway. I don't want to divert the thread too long. Fraggle just mentioned something I had been pondering on.