California dairy farms convert cow manure to biofuel, reducing methane emissions and addressing climate change, but raise respiratory concerns.

California's dairy farms, among the largest polluters in the region, are increasingly turning cow manure into biofuel, a cleaner alternative to traditional fuels like gasoline. While this approach is reducing methane emissions and addressing climate change, some residents are concerned that methane digesters could worsen existing respiratory issues connected to pollution from dairies.