Sean Smith is used to the strange looks. For the last year, he's been driving a recycling truck featuring a Holstein cow's behind, emblazoned with the words, "Powered by 100% renewable gas from ...

In recent decades, digesters that convert cow manure and other organic waste into biogas to create electricity or to fuel vehicles have spread nationally, and the number is expected to grow.

Plus, its abundance is actually detrimental to the planet. As Essaïdi points out on her website, manure contains phosphates and nitrogen that is harmful to soil, water and air. For its part, H&M ...

FRESNO, Calif. (AP) — A California man is going to prison for running a cow dung-to-green energy scheme that authorities say was a load of manure.