The BBC reports
Clues hidden deep in the trunks of ancient trees have revealed that last summer was the northern hemisphere’s hottest in 2,000 years.
Last year had already been confirmed as the world’s warmest on record by a large margin, at least since 1850, due to climate change.
But tree rings, which record temperature information far further back than even Victorian scientific records, now show just how unprecedented last year’s scorching temperatures were.
Read on at Climate change: Last summer hottest in 2,000 years, trees reveal


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