What future solar change is expected to cause a runaway greenhouse effect, boiling off Earth's oceans?

Answer

The Sun steadily increasing its luminosity as it ages

As the Sun ages, its luminosity gradually increases, which is projected to cause Earth to become too hot in the distant future, resulting in the oceans boiling away via a runaway greenhouse effect.

What future solar change is expected to cause a runaway greenhouse effect, boiling off Earth's oceans?

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