It’s not so much evolution he is predicting, but the biological and geological future of the Earth based on several known long-term effects.
The rate of cooling of the Earth’s interior, the gravitational interactions with other objects, and a steady increase in the Sun's luminosity is well documented.
The sun is just another star, and the basic of star phases is good understood. The sun will eventually burn up most of its fuel and enter a red giant phase that destroys the Earth if we don't intervene [0].
Comments
It’s not so much evolution he is predicting, but the biological and geological future of the Earth based on several known long-term effects.
The rate of cooling of the Earth’s interior, the gravitational interactions with other objects, and a steady increase in the Sun's luminosity is well documented.
The sun is just another star, and the basic of star phases is good understood. The sun will eventually burn up most of its fuel and enter a red giant phase that destroys the Earth if we don't intervene [0].
0: http://en.wikipedia.org/wiki/Sun#Life_phases