Amory Lovins outlines the steps we can take to end the world's dependence on oil (before we run out). Some changes are already happening -- like lighter-weight cars and smarter trucks -- but some require a bigger vision.

As he says: "Fire made us human, fossil fuels made us modern but now we need a new fire that makes us safe, secure, healthy and durable."

His new book and site, Reinventing Fire, offers actionable solutions for four energy-intensive sectors of the economy: transportation, buildings, industry and electricity. Lovins has always focused on solutions that conserve natural resources while also promoting economic growth.

He's saying, change the way we do things, so that we're doing them more efficiently, then add renewables, and we'll no longer need oil or coal...

He's very listenable. A lot of the talk is about lighter cars, but then he's already prototyping the ultra-efficient Hypercar -- to focus the world's attention on alternative approaches to energy and transportation.

He also talks about changing how we use electricity inefficiently. Just getting buildings to work more efficiently in the way that they use electricity, will save huge amounts of electricity.