The end of the Earth and the end of a habitat that can support life are 2 different things. The Earth will not be able to support life as we know it for 4 billion more years.
The sun is slowly heating up, and estimates are that in 500 million years, the Earth will be too hot to support life. That being said, life is resilient, and who knows what evolutionary changes might occur that would allow life to survive 500 million years from now. After all, the Sun heating up will be such a gradual process that evolution could most definitely keep up with it.
Then there is the fact that in 500 million years, even if we aren't destroyed by cataclysm, humans as we are today won't exist. We will have evolved into something else that wouldn't even remotely resemble humans. Probably Morlocks.
Technology also might allow us to escape our solar system and colonize across the universe.
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