Ключевые слова: air, carbon dioxide, clean atmosphere, climate change, co2, conservation, earth, eco, ecological, ecology, effect, emission, emissions reduce, environment, environmental problem, foot print, footprint, footstep, friendly, fuel, gas, global, graphic design, green energy, greenhouse, icon, impact, leaf, natural, nature, neutral, pictogram, planet, pollution, recycle, recycling, reduction, renewable, reuse, save, sign, smog, step, sustainability, sustainable, technology, vector illustration, waste,