- Forests have a protective role, prevent floods swept back. As a result of the deforestation, every year, we have to witness flash floods like in Lao Cai, Lai Chau, etc., swept away houses and land, causing great damage to people and land. erode. For example, the Lai Chau floods in 2014 caused about 20 deaths, causing major damage to the economy, homes, etc. 
- Forests also have the role of clearing the air, especially thanks to the forest where the phenomenon of smoke, smoke, smoke ... are minimized. But deforestation will reduce the possibility of filtering out the air and causing dense smog such as in China, the big cities have been covered by dense smoke. 
- Combustion of forest will cause damages similar to deforestation and forest burning, causing polluted air and smoke due to forest fire to quickly spread causing blindness in big areas, erosion. Forest fire in Thanh Hoa has burned hundreds of hectares of forest, losing large areas of protection forest.