In the last of his series, James May (pictured) sets off to find smarter, brighter and bolder ways of powering the planet for future generations.
May begins his journey by looking at the energy produced by the sun. In a unique experiment, he pushes a solar-powered car - one that has raced thousands of miles across the Australian desert - to its limits. But just how far will a solar car travel in Guildford at night?
In Seville, May visits the world's first solar-power station. This extraordinary cathedral of lights towers over the Spanish countryside. But, for all its high-tech glory, May discovers its curiously low-tech Achilles' heel.
Continuing his journey in the US, May encounters a group of dedicated aerospace engineers, who are planning to make a lift that will reach 20,000 miles into the skies, in a bid to build a power station in space. May watches, enthralled, as they take their first tentative steps towards their goal and a $2m prize.
While in Holland, May meets the first Dutchman who travelled into space - a man who has now put away his rockets and spacesuit, swapping them instead for kites, in an attempt to harvest the powerful winds of a high-altitude jet stream.
And, finally, May heads off into the deserts of New Mexico to seek out some modern-day alchemists. This group of scientists is hoping to conjure petrol out of thin air, with the help of only a few mirrors.
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