Ключевые слова: agriculture, bear, bio, car, carbon, care, change, children, climate, co2, color, conservation, crisis, day, desert, desertification, dioxide, dry, eco, ecosystem, electricity, energy, erosion, fire, flood, glacier, green factory, icons, illustrations, item, land, line, melt, nature, north pole, ocean, pack, polar, problem, protect, renewable, sea, set, sign, solar, sustainable, symbol, tree, world,