http://online.liebertpub.com/doi/pdf/10.1089/space.2017.2900...
In the "Why Mars?" section, Musk writes:
> It is a little cold, but we can warm it up.
In the very, very, long term we might be able to terraform Mars, but in the next few hundred years I think it would be more accurate to say that heating is a lot easier to manage than cooling.
We can survive in Martian temperatures that occur on Earth with nothing more than well-insulated clothing. But as Phoenix, AZ is discovering this week, even a few degrees over body temperature is really bad.
In the section on the importance of reusability, he writes:
> However, with frequent flights, you can take an aircraft that costs $90 million and buy a ticket on Southwest right now from Los Angeles to Vegas for $43, including taxes.
That's because the casinos subsidize it. Flights to and from Vegas from anywhere are cheaper than others, even more frequent or shorter flights.