Unexpected changes in climate.

September 13, 2015 9:13am CST
the Earth's average temperature has increased about 1 degree Fahrenheit during the 20th century. What's the big deal? One degree may sound like a small amount, but it's an unusual event in our planet's recent history. Earth's climate record, preserved in tree rings, ice cores, and coral reefs, shows that the global average temperature is stable over long periods of time. Furthermore, small changes in temperature correspond to enormous changes in the environment. 1,300 scientists from the United States and other countries, forecasts a temperature rise of 2.5 to 10 degrees Fahrenheit over the next century. And only we are responsible for this.
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