地球の寿命はどれだけ持つか？

私たちおは大丈夫だから、なんて考えていませんか！！
How Long Can Earth Sustain Life?
How much longer will the Earth be able to sustain life? Assuming our little blue marble
isn't done in by climate change, an asteroid strike, or some other cataclysm, the end
could come within 2 billion years.