The world has a very serious problem, my friend' Shiva went on. 'Poor children still die by their millions. Westerners and the global rich -- like me -- live in post-scarcity society, while a billion people struggle to get enough to eat. And we're pushing the planet towards a tipping point, where the corals die and the forests burn and life becomes much, much harder. We have the resources to solve those problems, even now, but politics and economics and nationalism all get in the way. If we could access all those minds, though...

I'm an optimist. My own fiction, while it has its own dark warnings about pitfalls ahead, depicts the potential of science to improve society by networking human minds.

You have to be able to generate usable energy without greenhouse gas emissions, and you have to be able to do it cheaply if you want people to choose that approach. That means new technologies.

AI does not keep me up at night. Almost no one is working on conscious machines. Deep learning algorithms, or Google search, or Facebook personalization, or Siri or self driving cars or Watson, those have the same relationship to conscious machines as a toaster does to a chess-playing computer.

In a VR setting, you tilt your head up, and you really have the vertigo and the sense that it goes up to infinity, and it's like you're in New York City or Dubai, and you're looking up at a giant skyscraper. You have a sense of awe.