Greenland has a low population density primarily due to its harsh climate and challenging living conditions. The island is mostly covered by ice, making it difficult to establish large settlements. The cold temperatures and limited arable land restrict agriculture, which in turn limits food production and the ability to sustain a large population. Additionally, the remote location and lack of infrastructure make transportation and communication difficult, further discouraging large-scale habitation. These factors combined result in a sparse population spread across a vast area.