Polly is a 10-year-old black-and-white Holstein cow, the oldest in a herd of about 300 on the Bar-Way Farm in Deerfield, Mass. Together they produce 2,000 gallons of milk each day. They also make ...
Human waste is certainly plentiful, but clean? In fact, it is -- if used the right way. That's why some British utilities are planning to harness the biomethane gas produced at sewage treatment plants ...
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