Ключевые слова: alternative, atmosphere, car, carbon, certificate, change, chemical, climate, co2, concepts, control, damage, dioxide, disease, earth, eco, ecological, ecology, effect, electric, emission, energy, environment, environmental, factory, fossil, free, friendly, fuel, future, gas, global, h2, hydrogen, increase, industry, mobility, oxygen, planet, policy, pollution, problem, protection, recycle, reduce, renewable, sustainable, warming, word,