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The environment
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What is it?
Ice cap
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What is it?
Pollution
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What is it?
Global warming
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What is it?
Flood
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What is it?
River
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What is it?
Lake
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What is it?
Ozone layer
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What is it?
Drought
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What is it?
Desert
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What is it?
Valley
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What is it?
Nuclear disaster
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