Ключевые слова: alternative, bio, biofuel, biogas, biomass, bottle, canister, carboy, container, control, conversion, digester, dispenser, drop, ecology, efficiency, electricity, emission, energy, environment, environmental, equipment, factory, farm, flame, fuel, gas, generation, generator, green, heat, illustration, light bulb, methane, operation, organic, plant, power, process, production, pump, recycling, renewable, renewable energy, resource, sustainability, sustainable, system, treatment, waste,