Stars go through periods in their lifetime, and when our Sun changes into a red giant our oceans will evaporate and Earth will become barren, like Mercury. Of course, this won't happen for another five billion years.
There are other things that are in the future. In three billion years, our galaxy is colliding with Andromeda. Also, the sun is getting hotter, so in a billion years much of our water supply may be gone.
Of course, if we somehow make it through this, the Big Freeze is inevitable; the universe will spread out farther than energy can reach planets and sustain a civilization of any kind.
With the exception of the Big Freeze, those are all going to happen. So don't say there is no proof.









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