Sometimes a big enough difference in quantity is a difference in quality. The difference between Earth surviving a 100 years or a billion is pretty significant.

Sometimes a big enough difference in quantity is a difference in quality. The difference between Earth surviving a 100 years or a billion is pretty significant. I can't even imagine how large a billion years is - it's just a mind bogglingly huge number. But my grand children will be around in a century - I might even be if medical technology improves or cryonics works. So it would be nice if the Earth is still in a nice state by then.