Tractor running entirely on Cow manure launched by Italy-based company - Hindustan Times

Farms & Farm Machinery #393

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British company unveils world's first cow-dung-powered tractor

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U.S. manure supplies run short as fertilizer prices soar - The Japan Times

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This Tractor Runs on Manure - Bloomberg

Insight: No poop for you: Manure supplies run short as fertilizer prices soar

Journalism – A wee walk

Tractor Prototype Runs on Cow Manure

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Italy's farmers head to Rome in tractor convoy as European anger spreads

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First tractor to be powered by cow manure developed by British company