Earth has a cow problem. Cow agriculture is one of the largest emitters of climate-warming methane to the atmosphere. But adding a type of red algae known for its methane-inhibiting properties to cow ...

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Clearly not all cow muck can be harvested. But if more food waste was collected, and more biogas plants built near dairy farms, "by 2050, we could be looking at 10-15 million households heated with ...