Check here for an interview excerpt; tangentially, see SpaceX releases first interior photos of its astronaut-carrying spacecraft (The Verge)
"The conversation eventually turned to another of Mr. Musk’s ideas: colonizing the red planet. Mr. Colbert protested that the planet is uninhabitable and people would have to live in domes. Mr. Musk said one challenge, warming up the planet, could be overcome.Also see Musk Ducks Super-Villain Question, Then Suggests Nuking Mars (BloombergBusiness), which includes the final interview topic:
“Give me the fast way,” Mr. Colbert says.
“The fast way is: Drop thermonuclear weapons over the poles,” Mr. Musk says with a confident chuckle."
"“I think the most important thing we need to solve this century is sustainable energy,” Musk said on the Late Show.Stephen Colbert Thinks Elon Musk Might Be a Supervillain - Digits - WSJ
Colbert responded: “You seem like the guy to do it.”"