Just two decades ago, wind and solar only accounted for a fraction of our global energy supply. Now, thanks to the rapid expansion of large wind and solar plants, especially in places like China, the conversation has changed from "whether" we can power our global economy with renewable energy, to "how" and "when".

Joining us is Eric Martinot, founder of the REN21 Renewables Global Status Reports. Eric shares with us about his conviction that the key to a clean energy future will lie in "distributed energy resources" -- things like small scale rooftop solar, microgrids, heat storage, and electric vehicles that can store and sell electricity back to the grid at off-peak hours.

Eric is now based again in Beijing, to launch his Global Initiative for Distributed and Locale Energy (DALE). To learn more or get even get involved in Eric's new initiative, check out http://www.martinot.info/dale