In our second programme about this most paradoxical of chemical elements, we examine how nitrogen-based fertilisers have ushered in an era of abundant food - but at a cost. We dispatch Rajini Vaidyanathan to see - and smell - first-hand how the nitrogen is extracted from raw sewage, to stop it killing off the fish and coveted blue crabs in the Chesapeake Bay. Meanwhile, Justin travels to Norwich to find out about efforts to genetically engineer crops that can extract the nitrogen they need direct from the air. bbc.in/1kJGuOP
Posted on: Wed, 04 Jun 2014 08:23:47 +0000
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