Ключевые слова: aqua, blue, business, button, care, chemical, clean, closeup, concept, dam, drinking, eco, ecology, economic, economy, element, energy, environment, fire, formula, green, h20, h2o, hydro, hydrogen, hydropower, keyboard, macro, nature, notation, ocean, oxygen, planet, pollution, power, rain, recycle, reserve, reservoir, river, save, scarcity, sea, shortage, sustainable, technology, water, waterpower, wave,