According to optimistic estimates, the end of habitability of Earth will come about

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According to current estimates, in about 3 to 4 billion years, the steady increase in luminosity from the Sun will cause the Earth's surface temperatures to become too hot for liquid water to exist, making it uninhabitable for complex life forms. This timeframe also coincides with the expected life cycle of our Sun before it expands to become a red giant and engulfs the Earth.

According to Optimistic Estimates, the End of Habitability of Earth