As the climate changes, the tree species living in a forest may also change. This change means that some trees species may die and new species may move into the area. Scientists find it difficult to know for sure whether tree movement and tree death result from a changing climate. Other factors, not related to climate, may also cause a forest’s tree species to change. The cause of yellow-cedar death was unknown for many years. The scientists in this study spent 20 years discovering the probable Topics: Active Forest Management, Wilderness, Climate Change, Long-term Research, North Pacific Coastal Rainforest, Seedlings, Tree growth, Yellow-cedar Tree.