[defterGoose]

There's just absolutely no evidence to support this statement. We don't know enough about meta/xeno-biology to say that life isnt a self-sustaining phenomenon in a thermodynamic sense. It may be that human-like "intelligence" is actually an emergent phenomenon, not unlike cancer, that has the potential to disrupt an otherwise homeostatic set of processes.

[__MatrixMan__]

I think he was referring to the eventual expansion of our star such that our orbit is smaller than its diameter. Of course that's no excuse to be a jerk in the meantime.

[cortesoft]

Well, our sun will eventually explode, which will certainly chew up the biosphere.

[goatlover]

The sun will make Earth uninhabitable in a billion years, give or take several hundred million, and depending on how long extremophiles can hold on.