The fall of North America and East Asia is usually blazing red. But in Europe, yellow dominates, but red is rare. why? Scientists believe that it may be related to the evolution of deciduous trees over the past 35 million years.
The mountains of North America and East Asia are north-south, and trees can find the ecological environment suitable for their survival along valleys and ridges. The same is true for pests. This may have led to an arms race about evolution, the emergence and improvement of anthocyanins, a red protective pigment. But the mountains of Europe tend to be east-west (like the Alps). Trees and insects are isolated because of peaks. If the weather is too cold, they die directly. The evolution of anthocyanins is not necessary, so few trees have evolved red.