[JeremyNT]

We evolved in this little window of time on this version of Earth.

In a billion years, when the Sun is hotter and Earth's oceans have all dried, it's probably not going to be a great hang any more.

[randomopining]

Yeah in a billion years. We should figure out the common issues (tragedy of commons, etc) that will follow us wherever we go -- before we try to leave. A billion years is plenty of time to focus on that.