Ключевые слова: alternate, alternative, care, change, climate, compatible, copyspace, ecologically, effect, energy, engine, environment, environmental, environmentally, farm, friendly, global, greenhouse, greenhouseeffect, human, mankind, nature, nonpolluting, oil, polluting, pollution, power, problems, sky, tower, warming, wheel, wind, windengine, windfarm, windmill, windpower, windwheel,