While what Bill Nye said here is true, here are a couple of points:

Obviously, there are parts of the globe that will be inhabitable far into the future, even as most of the globe is subject to extreme levels of heat, desertification, flooding, etc.  Here, I’m talking about land masses that are far above sea-level, and relatively cool, due their latitudes.  For example, most of Canada will be in good shape far longer than India.

We keep talking about space migration, i.e., exporting humankind to another planet.  That means finding a new home for all our greed, stupidity, and tribalism.  Doesn’t sound appealing to me.

Dealing with Climate Change