Old Tjikko, whose name could well belong to an ancient Viking Warrior, is a small tree in Western Sweden. At a mere 4 metres, it’s tiny compared to most trees in the Nordic forests. However, Old Tjikko hides a big story in its small body. It was born soon after the ice melted in Scandinavia, at the end of last Ice Age. It’s the oldest spruce tree, with roots that are almost 10,000 years old. …