'Biomethane' the bull
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Scientists harness cows' 'burp-power' as alternative energy

5 January 2014 Last updated at 03:22 GMT

Argentine farmers have long raised cows for meat, but now the country's cattle may soon be hailed for their contribution to saving the environment.

A team of scientists from the National Institute for Farming Technology in Buenos Aires has found a way of harnessing the methane gas which builds up in the animals' stomachs and converting it into an alternative energy source.

Ignacio de los Reyes reports.