Today it is apparent that human activity plays a major role in species extinction. Habitat destruction often leads to species extinction. Rainforests, which have very high biodiversity, have been destroyed at a rapid rate throughout this century. Deforestation of rainforests is often done so crops can be grown or animals can graze. Both of these activities decrease biodiversity tremendously.
Deforestation often leads to desertification.
Placing value on habitats and assessing the use and management of habitat areas has become a highly complex and multidisciplinary issue. Human activities with large numbers of people, often concentrated in large metropolitan areas, can have substantial impact on habitats and result in pollution. Points to Ponder 1. Extinction is a normal and natural occurrence that has happened many times in the history of the earth due to a variety of factors. Habitat destruction due to human activity is the primary reason for species extinction now.