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Chart shows 2,000 years of global temperatures

A color-coded chart shows how global temperatures have fluctuated over the past 2,000 years. The chart shows how abnormally warm recent temperatures are, but a different chart has been circulating online that excludes temperatures from recent years and has been championed by climate change contrarians. CBS News meteorologist and climate specialist Jeff Berardelli joined "CBSN AM" to discuss.
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