Blue growth rings in woody plant stems indicate years when cells failed to lignify properly due to summers that were too cold for normal growth. When temperatures drop, even tough trees face ...

Scientists studying pine trees and juniper shrubs in northern Scandinavia are revealing the weather of the past by looking at tree rings — which can tell us far more than just the trees’ age. ‘Blue’ ...

Volcanic eruptions and cold summers leave lasting marks in the wood of northern trees, unlocking the secrets of past climate extremes.