Ключевые слова: air, anti, atmosphere, background, barefoot, bundle, carbon, change, climate, co2, dioxide, earth, eco, ecology, ecosystem, effect, emission, energy, environment, environmental, exhaust, flat, foot, footprint, footstep, gas, global, green, greenhouse, illustration, impact, isolated, nature, planet, pollution, protection, reduce, reduction, renewable, save, set, smog, smoke, step, sustainability, sustainable, warming, white,