It seems pointless to talk about 2 trillion years from now. Fifty thousand years ago, at the beginning of the Upper Paleolithic, humans appeared to get smarter, inventing new tools and the first permanent structures. A million years ago our ancestors were Homo Erectus.
A million years from now, and maybe much sooner, humans will look different and most likely be adapted for a new kind of existence, such as space travel. A million years is enough time to evolve into a new species.
There is no guarantee that we will survive that long, but I have faith that people will find a way. The Earth will only be able to support life for about a billion years.
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