Published ArticlesPermaculture Design #102 November 2016 Permaculture Design #104 May 2017Household Cooking Fuel Hydrogen Sulfide and Sulfur Dioxide Emissions from Stalks, Coal and BiogasBiomass Utilization Through Biogas Systems: Relationships to Respiratory Health and Global Climate ChangeWhy Chinese Continue with Biogas DigestersAssessing the Benefits of Biogas