Blue growth rings in woody plant stems indicate years when cells failed to lignify properly due to summers that were too cold ...
Strange blue rings found in Scandinavian trees leave scientists perplexed - Rings hint at unusually cold summers in Norway ...
In Norway, scientists have found blue rings in trees that hint at how volcanic eruptions disrupted growth throughout history.
Volcanic eruptions and cold summers leave lasting marks in the wood of northern trees, unlocking the secrets of past climate extremes.
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