Why we do it 

Climatic variability is recurrently threatening water supplies across the globe, and future climate change and land degradation will put even more pressure on water supplies and land resources. Land degradation includes deforestation, slash-and-burning, expansion of cultivation, increasing water runoff and erosion, and soil degradation. Land degradation is, together with climate change, named as the biggest global threat to sustainable development.
But recent success stories from around the world show that forest cover is key to tackle land degradation in relation to climate change. Forest cover slows down rainfall erosivity, runoff, sheet erosion and gullying, and is thus crucial to fight land degradation and raise plant and crop productivity. Forest cover is also crucial to climate change adaptation, through its positive hydrological impacts on the groundwater level. And importantly, forest cover is also crucial for climate change mitigation, as trees and forest soils capture carbon dioxide and take it out of the atmosphere.
Forests are more than a collection of trees. A healthy forest ecosystem delivers services such as non-timber forest products that can foster the development of local micro-economies. This is reducing human pressure on the land. In fact, the potential for tree crops, fruit trees, honey production and incense-derivates in (sub)tropical regions is huge, but remains largely untapped