I’M WITH ELON: Thermonuclear Blasts and New Species: Inside Elon Musk’s Plan to Colonize Mars.

As Robert Heinlein (PBUH) said, Earth is too fragile a basket to hold all of humanity’s eggs.

Flashback: The urgency of space colonization.

Also: James Fallows: The Coming Age of Space Colonization. Now that Elon is a Designated Party Enemy, The Atlantic probably wouldn’t give this topic such a sympathetic treatment, but this was in 2013.