It's obviously tricky to convert cellulose to a useful biofuel. I think actually the most efficient way to use cellulose is to burn it in a co-generation power plant. That will yield the most energy and that is something you can do today.

I'm extremely confident that solar will be at least a plurality of power, and most likely a majority... in less than 20 years.

If you get up in the morning and think the future is going to be better, it is a bright day. Otherwise, it’s not.

Well, my motivation behind Tesla is really to do as much good as possible for the environment and the electric-vehicle revolution. I think there is still a lot of work to do and if we were to sell to a big company, I'm not sure it would progress at the same pace.

No I don't ever give up. I would have to be dead or completely incapacitated

Physics is really figuring out how to discover new things that are counterintuitive, like quantum mechanics. It's really counterintuitive.

I would like to die on Mars. Just not on impact.