The deforestation is due to the indiscriminate felling of forests, or burning, the progressive disappearance of the forest is also due to the removal of trees and reducing ground cover , which can lead to erosion by wind and water to prevent the establishment of new trees. The impact of the indiscriminate felling of forests on the planet has been extremely serious. About 10,000 years ago. That is, before the men begin to engage in agriculture, this type of biome extended over a 4200 million hectares, equivalent to two thirds of the earth's surface. At present, the natural forests have disappeared in large parts of Asia, Europe and South America and deforestation threat to the Amazon, the largest natural reserves in the world.
The forestry is a set of techniques designed by humans for growth and development of forests in areas where it intends to do so. Among the forestry techniques can include pruning and thinning or selective logging of trees for various purposes.