Learn more about these signs of summertime cold, perhaps tied to volcanic activity in 1877 and 1902.

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

Scientists in Norway have found blue rings in trees that hint at how volcanic eruptions disrupted growth throughout history. When scientists test tree samples to study the ages through their rings, ...

Because trees and shrubs can live for centuries, these blue rings provide a valuable record of past cold summers. By studying pine trees and juniper shrubs from northern Norway, scientists identified ...

In order to grow properly, trees need an adequate period of warmth during their growing seasons; otherwise, the cell walls [… ...

How extreme weather leaves a lasting mark on trees and shrubs POZNAŃ, Poland — In the Arctic’s harsh borderlands, where trees ...

In Norway, scientists have found blue rings in trees that hint at how volcanic eruptions disrupted growth throughout history.

Scientists studying tree rings in northern Norway have linked ‘blue’ rings, caused by cold summers, to volcanic eruptions ...

In the frigid landscapes of northern Norway, an unusual phenomenon etched ... A close-up of a young green pine tree (main) and an image of a volcanic eruption (inset). A close-up of a young ...