endangered species(polar bear) - at risk of not existing , emission - like car exhaust , disposable - thrown away after one use, pollutant - what causes pollution, urbanization - when rural areas become like cities, global warming - warming of earth, renewable energy - can be replaced, conservation - careful preservation and protection of something, habitat - the place or environment where a plant or animal naturally or normally lives and grows, extinct - no longer exists, The 3 R's - Reuse, reduce, recycle,

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