Ключевые слова: agriculture, background, balance, battery, beginning, car, care, cheerful, conservation, day, development, drop, earth, eco, ecology, education, energy, environment, ethics, fertilizing, friendly, future, garden, give, global, green, ground, growth, hand, happy, helping, icon, learning, life, lifestyle, nature, new, old, outdoor, plant, pollution, protect, recycle, reduce, responsibility, retirement, save, science, solar cell, springtime, sun, sustainable, together, water, windmill, women, world,