Global warming: Proof Earth heated up in medieval times WITHOUT human CO2 emissions

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The scientists were particularly interested in crystals found in layers deposited during the ‘Little Ice Age,’ approximately 300 to 500 years ago, and during the Medieval Warm Period before it.

Both climate events have been documented in Northern Europe, but studies have been inconclusive as to whether the conditions in Northern Europe extended to Antarctica.

Global warming: Earth heated up in medieval times without human CO2 emissions | Mail Online.