The population history of the island remains highly controversial. In addition to internal conflict, the population crash has been attributed to “ecocide,” in which the Island's resources were exhausted by its inhabitants, reducing its ability to support human life.
Basically , they cut down tress faster then they could grow back. This ruins photosynthesis (The processes that turns carbon to oxygen) . So without the process that turns carbon to oxygen, the carbon will start to build up causing all organisms that depend on oxygen to have a harder time taking in the proper amount of oxygen they need. This may not kill them instantly but can definitely weaken a lot of there systems and result in a shorter/below average life span.
Primary succession is a method of fertilizing soil that was barren and had never supported plant life, for example soil left over by a moved glacier of lava.
