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Several cities, including the Austrian city of Graz, have already made the move to either biodiesel or biogas public transportation systems.
These include groundwater heat pumps, fuel cells, solar thermal and photovoltaic panels, new fuels such as hydrogen, biomass, biogas , or bio-oil, and shared energy storage systems.
The issue is not what they use - fuel wood, agricultural waste, biogas , or something else - but that it should be available in quantities that make a difference to their lives.
Using our technology in exploiting biogas will improve production by 60 per cent from the same quantity of material.
These digesters help prevent deforestation, since biogas rather than wood is used for cooking.
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