Ключевые слова: beware, biohazard, biological, burying, caution, coverall, crossbones, danger, dangerous, death, digging, disaster, ecologist, ecology, environment, environmentalist, gas mask, greening, ground, growth, hazard, improve, nature, person, pit, planting, poison, polluted, pollution, problem, protective, reforestation, research, researcher, respirator, safety, sapling, scientist, shovel, sign, skull, sky, soil, sprout, suit, symbol, volunteer, warning, worker, zone,