Earth · Habitability transition
Earth becomes uninhabitable for complex life
The increase in the luminosity of the Sun will gradually disrupt the carbon cycle and the stability of the oceans.
What this means
This is not the exact date of the disaster, but an order of magnitude for the limit of long-term surface suitability. The result depends on the climate model and the evolution of the biosphere.
PRIMARY SOURCE
Habitable Zone Lifetimes of Exoplanets around Main Sequence StarsAstrobiology ↗