Ключевые слова: activist, air, background, breathe, chemical, danger, device, disease, earth, ecological, ecology, environmental, epidemic, expression, filter, garbage, global, humanity, infection, landfill, mask, military, nature, oxygen, planet, plastic, pollution, poster, prevent, prevention, problem, protect, protection, protective, radiation, rescue, respirator, rubbish, safety, save, signs, smell, threat, toxic, trash, volunteer, waste, wear, woman, young,