As human populations grow in numbers, they require ever more space for agriculture. A lot of forest is lost in this way, particularly in densely populated regions. However, the economic exploitation of resources also destroys forest. Although logging companies are usually interested in only a few trees, the roads they construct while extracting the timber make remote forests accessible for settlers. Forest is also lost during the mining of minerals. In addition, ever larger areas are clear-felled for the cultivation of plants that play a major role in the global economy, such as oil palms.