I hope Andrew Clearfield takes full advantage of being a student at Carnegie Mellon University. He has a lot to learn. The globe has been getting progressively warmer since the Pleistocene ice age epoch peaked 165 million years ago. Why is anyone surprised• Man’s contribution to this may be because the world’s population has doubled over the past 45 years and all the additional exhaling of CO2 as we work for a living is a factor. William R. CaseyWest Mifflin

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