Arizona natural-gas users could soon be heating their homes and cooking their food, and perhaps fueling their vehicles, with renewable natural gas made from cow manure or sewer waste. Southwest Gas, ...
Biogas made from dairy and pig manure has long been an energy source non grata for environmental groups across the country.
By burying agricultural waste deep underground, Vaulted Deep, a carbon removal startup, promises to keep climate-warming emissions out of the atmosphere.
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