Deforestation is when forests are destroyed by cutting trees (logging) and not replanting them. The most common reason is to clear the land to make farms and ranches. They also cut trees for firewood and lumber and to make room for cities. Deforestation destroys the habitat of many animals, leading to their death. The loss is more severe in so called primary forests, which are forests that have yet been untouched by humans. Deforestation also releases sequestered carbon.