Last week, we discussed a poop-powered rocket. Now a new car promises we’ll see human waste’s potential closer to home–or further from home, but not as far as space. The Bio-Bug, a modified Volkswagen Beetle, can run on fuel made from raw sewage.

“Biogas upgrading” has allowed GENeco, Bio-Bug’s developer and part of the British waste-processing companies that make up Wessex Water, to create methane from human waste.

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As we’ve mentioned before, about 18 percent of methane from human activities is generated in the guts of livestock. As such, cow belching, which is how much of this potent greenhouse gas sees the light of day, has become an important environmental concern. In an effort to make cows less gassy, scientists have tried everything from transferring special methane-reducing bacteria from kangaroo guts into cow guts, to garlic supplements, to promoting a switch to kangaroo-burgers.

But no one wants to be in the field measuring cow burps. Now a team of scientists from New Zealand have a designed a model cow to study the issue in the lab. In fact, they’ve built a whole herd of virtual cows, named Myrtle, Buttercup, Jesse, Ethel, Daisy and Boris. Each consists of a system of tubes, pumps, jars, monitors, and blinking lights which simulate the entire bovine digestive system.

As News 3 reports:

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Hungry for a kanga-burger? Replacing beef and mutton with kangaroo meat could significantly cut down on ruminant livestock emissions, according to a new report commissioned by the Australian government. Bovine belching is a massive source of methane emissions. But while a single cow can produce 300 to 500 liters of methane gas per day— enough to inflate 80 party balloons—kangaroos produce almost none. In other words, if cattle were Hummers, kangaroos would be Priuses.

As we’ve reported previously, Australian scientists have tried to fix the problem by transferring digestive bacteria from kangaroos into the guts of livestock. But this new report suggests that switching right to kangaroo meat could be a better move.

A potential model cited by the report would replace 7 million sheep and 36 million cattle with 175 million kangaroos by 2020, allowing Australia to cut about 16 megatons of carbon emissions every year. As the price of emission permits increases, kangaroo harvesting would become a lot cheaper than livestock farming. Kangaroos are hardier than livestock, and could better handle the effects of climate change like decreased water supply. They would be the ideal free range animal and yield meat that is high in protein and low in fat.

Still, there’s the 175 million kangaroo question: Will anyone eat it?

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