[meric]

The current big threats to humanity are climate change and nuclear war. They are threats we create for ourselves, by relentlessly expanding the economy and inventions of new technologies. Ironically our solution to it is to further expand our technology and economy into other planets.

[vatotemking]

Elon is addressing climate change via SolarCity and Tesla.

[patrickmclaren]

Indeed, new human colonies on other planets will not be immune to our existing problems.