Ключевые слова: alternative, bio, biogas, business, chemical, chemistry, city, climate, construction, damaged, dirty, ecology, electricity, emissions, energy, environment, environmental, factory, fuel, garbage, gas, generation, global, green, industrial, industries, industry, manufacturing, methane, modern, nature, pipe, pipes, plant, plastic, pollute, pollution, power, production, recycle, river, rubbish, smoke, steel, synthetic, technology, toxic, trash, tube, waste,