The future of humanity is going to bifurcate in two directions: Either it's going to become multiplanetary, or it's going to remain confined to one planet and eventually there's going to be an extinction event.

And we need things in life that are exciting and inspiring. It can't just be about solving some awful problem. There have to be reasons to get up in the morning.

The primary means of energy generation is going to solar. It will at least be a plurality, and probably be a slight majority in the long term.

I tend to approach things from a physics framework. And physics teaches you to reason from first principles rather than by analogy.

The lessons of history would suggest that civilisations move in cycles. You can track that back quite far - the Babylonians, the Sumerians, followed by the Egyptians, the Romans, China. We're obviously in a very upward cycle right now and hopefully that remains the case. But it may not.

When people really understand it's do or die [and] if we work hard and pull through, it's going to be a great outcome; people will give it everything they've got.

I think Tesla will most likely develop its own autopilot system for the car, as I think it should be camera-based, not Lidar-based. However, it is also possible that we do something jointly with Google.