Old growth forests are important for more than just the rare plant life found in their ecosystems. According to Kathryn Kolb’s 2017 Native Forest Calendar, these forests contain enriched soils from the hundreds of trees that have lived and died there. The soil makes it possible to keep the forest a safe ecosystem for many years to come. Thousands of species of trees, plants, fungi and microorganisms in the soil from these forests evolve for a few millennia. These symbiotic relationships help these forests not only stay sustainable, but also improves a tree’s ability to get water and nutrients from the soil. In return, the fungi are given sugar and carbohydrates from the tree. When this relationship is destroyed by clear-cutting and logging, The forests lose vital factors in keeping the forests alive, and destroys the work of millions of years.