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High Confidence That Planet Is Warmest in 400 Years – Less Confidence in Temperature Reconstructions Prior to 1600

There is sufficient evidence from tree rings, boreholes, retreating glaciers, and other proxies of past surface temperatures to say with a high level of confidence that the last few decades of the 20th century were warmer than any comparable period in the last 400 years, according to a new report from the National Research Council.

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