Ключевые слова: air, background, carbon, change, clean, climate, co2, commitment, concept, conservation, dioxide, earth, eco, ecology, economy, emission, energy, environment, environmental, footprint, forest, friendly, gas, global, grass, green, greenhouse, illustration, industry, landscape, leaf, management, natural, nature, neutral, plant, pollution, recycle, reduce, reduction, renewable, sign, spring, summer, sustainable, symbol, technology, tree, warming, waste,