Large parts of the tundra of northern Scandinavia are evidence of climate change. Sorrow spreading areas of dead trees extend to the Arctic Ocean.

The birch trees have been destroyed by the larva of the so-called autumnal and winter moths. They attack the trees and eat their leaves. According to the climat change new species of moth are spreading north-wards. The mild winters are beneficial for the moth eggs.

Such major changes in nature can create ripple effects throughout the entire eco-system. In conclusion, the ptarmigan, for example, does not have any birch buds as food anymore.