pollution, harmful substances in air, water, or land, waste, unwanted materials thrown away, recycling, using waste again to make new products, renewable energy, energy from sun, wind, or water, fossil fuels, coal, oil, gas, climate change, long-term changes in world climate, global warming, rise in Earth’s temperature, deforestation, cutting down forests, endangered species, animals or plants close to extinction, carbon emissions, gases released into the air, natural resources, materials from nature we use, sustainable, not harming future generations, environmental damage, harm done to nature, protection, keeping something safe, conservation, careful use of nature

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