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In the concluding episode of his exploration of how energy drove human history, Justin Rowlatt looks at the monumental challenge of weaning ourselves off fossil fuels.
Solar and wind could meet all of humanity鈥檚 energy needs, but can we switch over before climate disaster strikes?

Fortunately we have the means at our disposal, according to clean-tech enthusiast and investor Ramez Naam. Our fossil-fuelled global economy has enabled a rapid collapse in the cost of renewable energy and electric vehicles.

And now we are seeing a snowballing of government action to decarbonise our economies, according to UN climate negotiator Christiana Figueres. But many problems remain. Energy historian Vaclav Smil points out that we still have no easy way to store renewable energy, or use it to make billions of tons of cement and steel. Sheffield-based ITM Power hope that their green hydrogen could solve many of these problems. Plus electricity historian Julie Cohn says another option might be to build a global electricity grid.

Producer: Laurence Knight
Presenter: Justin Rowlatt
Studio manager: Rod Farquhar
Production co-ordinator: Zoe Gelber
Editor: Rosamund Jones