Harvesting Gas

I've heard a lot of talk about harvesting the methane produced by cows to use as energy for powering our lifestyles, but it would seem that it's getting a little closer to becoming reality.

Researchers from the National Institute of Agriculture Technology in Argentina are on it.  However, they're focusing on gaseous emissions from the smiling end of a cow.  I have to believe if we capitalized on both ends, the power would be golden.

I'm curious if it works exclusively with cows, or if we could hook something up to my husband, as he could likely power up our entire neighborhood and then some.