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.