Late last year Elon gave a presenation at the 67th International Astronautical Congress in Guadalajara, Mexico. This paper is a summary of that presentation, and includes slides and pretty pictures.
Making Humans a Multi-Planetary Species (html)
Making Humans a Multi-Planetary Species (full text PDF)
My favorite slide:
What do you think? Genius? Nuts? Let me know.
Evadot 