5. Due to global warming, ice sheets are melting quickly in both poles. It is expected the rise of sea level in a near future.

6. As a result of constant and increasing fossil combustion, the atmosphere contains more chemical gases and acids than ever. before. Sulfur dioxide and nitrogen oxide are released from power plants and factories pipes into the air. The deposition of these dangerous substances on the ground (trees, houses, rivers,animals…) occurs when they fall through rain, smoke or dust.

7. Waste and rubbish materials can be recycled. Disposal containers to dump plastic, glass, organic waste are available in cities. Clean energies are the alternative to polluting fuels.. Wind turbines can produce electricity cheaply.