Another reason is the burning of forests. Farmers choose to burn forests. Since they need to prepare new planting areas and they need to increase planting areas. They are setting fire to a pile of dry wood in the forest or creating hay in agricultural areas. Since it is fast and easy. It makes can plant to new plants faster and increase more the cultivation areas. But the burning causing dust that is harmful to the respiratory system, such as PM2.5 dust. Fire may spread to other areas. It cause a wide fire. And burning maybe spread to communities or spread to wildlife habitats. There is danger to human and wildlife. When land is expensive. The poor people don’t have money to buy land for cultivation. Adjusting the topsoil with labor takes a long time and requires faster burning (Onsanit, 2009). Burning forests has many disadvantages and also affects humans and wildlife as well.