ÃÛÑ¿´«Ã½

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As shale oil and gas revolutionises the US energy sector, Justin Rowlatt speaks to author Gregory Zuckerman about the colourful characters who pioneered the art of fracking. Also in the programme, the ÃÛÑ¿´«Ã½'s Stephen Evans in Berlin explains how Germany's U-turn over nuclear energy following Japan's Fukushima disaster has led to a controversial rebound in coal-fired power stations - and carbon emissions. And, Alan Johnson reports from Rome about a very different local controversy - the plan to use an aircraft carrier, the "Cavour", as a giant floating showcase for Italian industry.