"Working with biogas also allows the students to quickly grasp the 
interconnection between environmental stewardship and increased 
quality of life. ???There are so many benefits when a biogas 
system is functioning,??? says Axelsen. ???It is essentially 
wasted gas from the pigs that is captured and used at no cost and 
very little labor input. Three pigs produce enough gas to cook two 
meals per day for a family of five. And the biogas means that they 
do not have to collect firewood, or breathe soot from wood and 
coal???one of the reasons for the rise in tuberculosis in the 
region. And,??? she adds, ???it is clean burning and low in carbon 
emissions.???

"Hands-on Development Training for a Proactive Chinese Civil 
Society"

http://www.worldwatch.org/node/5407

James Gabriel Duncan

BioEnergy and Sustainable Technology Society
http://grove.ufl.edu/~bests/