What challenges does the Earth face? Pollution Pollution is the release of harmful substances into the environment. It damages the quality of air, water and land. Earth's greenhouse gases, such as carbon dioxide, naturally trap heat in the atmosphere and warm the planet. They keep the Earth at a suitable temperature for life. 1 When we burn fossil fuels – such as coal, oil and gas – large amounts of greenhouse gases are released. These gases trap extra heat and cause global warming. 2 Global warming contributes to climate change. 3 AIR POLLUTION Air pollution is the release of chemical substances, gas or smoke into the atmosphere. Human activities are the main cause of air pollution. It contributes to climate change. LIGHT POLLUTION Light pollution is the excess of artificial light at night. It prevents a clear view of the night sky. It makes it difficult to sleep and causes fatigue. NOISE POLLUTION Noise pollution is constant loud noise that is irritating or even harmful. It causes headaches, lack of concentration and deafness. Climate change Climate change refers to the long-term changes in temperatures and weather patterns that are mainly caused by high levels of carbon dioxide (CO2) and other gases in the atmosphere. word bank climate change global warming greenhouse gases pollution 98 · n i n e t y - e i g h t
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