Putting masks on cows might seem an unlikely way of saving the planet - but the plans have received the royal seal of approval.
The methane-catching devices, an invention backed by the Prince of Wales, could be fitted to British herds to reduce emissions of the powerful greenhouse gas.
Startup Zelp, founded by Francisco Norris, uses pioneering technology to convert methane burped out by dairy and beef herds into water and carbon dioxide in an attempt to stem emissions.