Bird, Animal, Rock, Water, Sport, Sports, Soil, Plant, Summer, abstract, background, black, blue, brown, chemicals, contamination, cracked, crude, danger, dangerous, desertification, dirt, dirty, drought, dry, earth, ecology, environment, environmental, global, ground, industrial, land, natural, nature, oil, petrochemical, petroleum, polluted, pollution, soil, spill, surface, texture, toxic, warming, waste, water, commonwealth, summer, macromolecule, mishap, geological process, achiever, slip, dryness, dirtiness, misfortune, impurity, environmental condition, state, fuel, unclean, lipid, season, molecule, nation, fall, trouble, soiled, fossil fuel, heating, person, situation