Ключевые слова: agrofuels plant, alternative, biofuel, biofuels, biogas, biological, biomass, construction, crop, dung, eco, ecology, electric, electricity, energy, environment, environmental, factory, forest, garbage, generation, generator, graphic design, icon, industry, landfill gas, leaf, light bulb, line symbol, linear, nature, pictogram set, plug, power, powerplant, refuse, renewable, resource, sign, solid waste, source, station, storage, structure, sustainability, sustainable, technology, turbine, vector illustration, wood,