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Atmosphere: Oxygen, Hydrogen, Nitrogen, Carbon monoxide, Carbon dioxide, Ozone, Sulphur monoxide.
Pollution: acid rain, contaminated water, air pollution, pollutant, contaminant, chemicals, toxic waste.
Geographical: soil erosion, desertification, drought,floods, overfishing, over-felling, deforestation.
Energy: fossil fuels, coal, gas, petroleum, solar, tide, wind power, nuclear, marsh gas, methane, biogas.
Recycling: plastic, paper, glass, spare parts/ components, bottle tops, ink cartridges.
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