India, June 10 -- India has a habit of discovering useful ideas and then burying them under slogans. Biogas is one such idea. It is routinely described as a clean fuel, a rural livelihood generator, a waste-management solution and a climate instrument. All of that is true. But unless the government builds a sensible policy architecture and a financially viable market structure, biogas will remain a useful concept trapped in pilot projects, small installations and optimistic speeches. That would be a mistake. In a country that produces huge volumes of cattle manure, agricultural residue and municipal organic waste, biogas is one of the few energy options that can simultaneously address emissions, waste disposal and fuel import dependence. ...