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- Air pollution: smog and acid rain.
- Surface and groundwater. Soil degradation.
- Noice pollution.
- Decrease in the ozone layer: causes and consequences.
- Climate change. Green house effect. Causes and consequences.
- Depletion of natural resources.
- Urban solid waste. Electromagnetic pollution. Toxic and hazardous chemicals, including radiactives. Waste management.
- Species extinction. Conservation of biodiversity.
- Deforestation and desertification.
- Demographic explosion. Control of the growth of the world population.
- Correct use of resources: reduce, reuse and recycling.
- Renewables energies.
- Oceanic water pollution: plastics, heavy metals and oil slick.
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