We humans are an energy hungry lot - and we get hungrier with each passing year. But what happens when we've chewed up all the energy options on Earth?

Astrophysicist Natasha Hurley-Walker has just the thing. We could live in a Dyson sphere.

Well, a series of them actually.

It's pure sci-fi - but so is the notion of unlimited economic growth that's driving our energy appetite.

This talk was recorded at Ockham's Razor Live at the Perkins Institute in Perth.

Guest:

Dr Natasha Hurley-Walker, ARC Future Fellow

International Centre for Radio Astronomy Research, Curtin University, Perth