The rising level of carbon dioxide is threatening human life. If the level of carbon dioxide continues to rise, people would have to retreat inland. Today the level of carbon dioxide continues to rise. People would have to retreat inland, because of the concentration of carbon dioxide in the atmosphere. The concentration of carbon dioxide is rising, and this will lead to a rise in the sea level. Then sea level will rise and rise …
showed first 75 words of 281 total

showed last 75 words of 281 total
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