Many plants and factories pollute the air, causing serious pollution problems in cities., Global warming happens when people cut down forests and destroy the natural environment., Scientists warn that if temperatures rise too much, it will be hard to protect the environment., The greenhouse effect is making the climate warmer and leading to more acid rain., Some rivers are polluted by waste from plants and factories, which destroy fish and animals., Environmental protection is very important if we want to keep the environment clean and safe., Because of climate change and pollution, we must work harder to save nature and stop global warming.,

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