Tree rings show that it’s never been so hot in the last 1,200 years

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The Middle Ages were tumultuous in climatic terms. It saw a cold phase, the Little Ice Age, and a warming period, the Medieval Climatic Optimum. The latter, according to data reconstructed from tree rings, saw temperatures sometimes higher than today's in northern Europe. This is an enigma: physics cannot explain this period of exceptional warmth, and climate models calculate more moderate temperatures for the period between the 10th and 14th centuries.
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