Concrete Evidence of Global Warming

The Earth's average temperature IS rising, as the average temperature has increased by about 1 degree Fahrenheit (0.6 degrees Celsius) around the world.
More evidence that the Earth's average temperature has increased recently can be seen in the spring ice thaw and fall ice freeze: The spring ice thaw in the Northern Hemisphere occurs 9 days earlier than it did 150 years ago, while the fall ice freeze begins 10 days later than it used to.
Since weather record-keeping began in the mid-1800s,

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