Ключевые слова: air pollution, biology, care, change, charity, climate, climate change, conservation, corporate, development, earth, earth day, eco, ecology, ecosystem, energy, environmental, environmental conservation, friendly, global, green, growing, growth, hand, idea, international, investment, knowledge, learning, living, nature, peace, philosophy, planet, pollution, preservation, protection, recycling, renewable energy, responsibility, safety, save, social, soil, support, sustainable, volunteer, world,