How was the use of trees on Easter Island unsustainable?

The use of trees on Easter Island was unsustainable primarily due to the extensive logging required for constructing the large moai statues and transporting them across the island. As the population grew, the demand for wood for building, fuel, and agricultural purposes increased, leading to deforestation. This resulted in soil erosion, loss of agricultural productivity, and ultimately contributed to societal collapse, as the islanders could no longer sustain their livelihoods or support their population. The depletion of trees also impacted the island's ecosystem, further exacerbating the challenges faced by its inhabitants.