- climate scientists have written papers about this, and they believe the human-caused global warming cannot be enough to drive a runaway greenhouse effect that evaporates the oceans.
On the other hand, there are papers arguing that about 1.1 billion years from now, the Sun will become 10% brighter than today, and a runaway greenhouse effect may evaporate the Earth's oceans. Then the water in upper atmosphere will photodissociate and the hydrogen will sail off into outer space.