Will Solar and Wind Power Our Future? Part 1

In many countries, solar and wind are now the cheapest new generation to install, though they provide just 4% of global electricity today. Scaling up 25X would be an extraordinary challenge, but they make power without carbon. Could wind and solar one day power the world, or not? Robert Bryce, a best-selling author, and Leia Guccione, Managing Director of Carbon Free Electricity at RMI, discuss.