Unlike people, trees can grow to become as old as thousands of years old. Additionally, unlike people, trees do not age fast, nor do they grow with all their organs intact. In fact, they recreate the materials they need for survival every year, i.e., leaves, seeds and flowers. It is rare for a tree to die of old age alone. Instead, it is the exposure to the stress of wind, disease, insects, pollution, soil erosion, soil compaction, weather and people that will most likely cause it to deteriorate and die off. Research indicates that younger forests are better at storing carbon. One reason that might explain this is that newly deforested areas are open and sunny and are easily recolonized by fast growing species. These plants are able to extract carbon from the air and incorporate it into their biomass more quickly than mature trees that must compete with more neighbours and less sunlight.