Anaerobic digester loans showed “significant delinquency rates,” the U.S. Department of Agriculture said, while environmental groups see the technology driving an expansion of large-scale animal ...

Wood, coal, or natural gas are the usual culprits in terms of cooking fuel, but some clever chemistry makes poop into a surprisingly sustainable alternative.

When fuel ran out during the second world war, some farmers in Germany and France made their own fuel by covering cisterns of manure and capturing the methane that was generated. Now, governments are ...