Researchers put plastic backpacks on cows, then inserted tubes into their rumens (their biggest digestive tract). Then, they extracted the methane--about 300 liters a day. That's enough to run a car, or a fridge for 24 hours.
"[We] believe that such technology could be used to collect methane on larger scale, and even imagine a future farm with a couple of these cows used to provide energy to satisfy the farm's needs," Sorondo says.
Backpacks For Cows Collect Their Fart Gas And Store It For Energy