London’s Tube is the oldest in the world, and in terms of how hot it gets underground in summer it shows. Jon Excell reports on how London Underground is spearheading an initiative aimed at cooling the system.
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Europe's largest tidal array in the Pentand Firth off Orkney will eventually generate up to 86MW of power. What will it take for tidal energy to make an appreciable contribution to the UK's energy needs?