The contamination of air, water, or soil by harmful substances., Pollution, The cutting down of trees on a large scale, usually for farming or construction., Deforestation, The gradual increase in Earth's temperature due to greenhouse gases., Global Warming, Long-term changes in temperature, weather patterns, and rainfall on Earth., Climate Change, When harmful chemicals or waste are dumped into rivers, lakes, or oceans., Water Pollution, When smoke, dust, and gases make the air dirty and unsafe to breathe., Air Pollution, The process of turning waste materials into new usable products., Recycling, A sudden and violent shaking of the ground caused by movements of the Earth's crust., Earthquake, The sudden movement of rocks and soil usually caused by heavy rain, earthquakes, or erosion., Landslide, A huge ocean wave caused by an underwater earthquake and volcanic eruption., Tsunami.

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