Scientists estimate that if nothing is done about global warming, then the sea levels could rise anywhere from twent inches to three feet over the next few decades, which would have a significant impact on countries like Greenland and Australia, not to mention cities like New York.
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It’s hard to tell, because the rapid changes in temperature causing the melting of ice sheets and glaciers that have occured recently are hard to factor into the models currently available. In the 12th century, there was a warm period where the sea level was 20 cm higher than it was today. In the 18th century, there was a cold period where the sea level was 25 cm lower than it was today. However, the models that we have today indicate that if the temperature was raised by 3 degrees farenheit, the sea level would rise between .9 and 1.3 meters on average.
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