AQUIFER, ATMOSPHERE, CARBON DIOXIDE, CARCINOGEN, COAL, COMPOST, CONTAMINANT, CONTAMINATION, DISPOSABLE, EMISSION, ENERGY, ENVIRONMENT, FOSSIL FUEL, GEOTHERMAL, GLOBAL WARMING, GREENHOUSE EFFECT, GROUNDWATER, HERBICIDE, LANDFILL, RECYCLE, RENEWABLE, TOXIC, TOXIC WASTE, WATER CONTAMINATION, AIR POLLUTION, ACID RAIN, OIL SPILL, EXHAUST FUMES.

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