Agri Kultuur December / Desember 2018 - Page 36

Why massive effort needs to be put into growing trees on farms Philip Dobie: Senior Fellow, World Agroforestry Centre (ICRAF) I t’s now over 50 years since the world was first warned that resources were being used at an unsustainable rate. It has now been estimated that almost one quarter to one third of the world’s land is degraded to some extent. Degradation refers to land that’s lost nutrients, or has changed physically, and therefore produces less or supports less life. This is mostly caused by the loss of soil, changes in the quality of the soil, or changes to land cover – like trees being cut down. About 20% of agricultural land and 40% of forests are degraded. Degradation reduces our capacity to feed a world population that will reach at least 9 billion people by 2050 and it destroys ecosystem services – like the supply of clean water. Also, when soil is degraded, and trees destroyed, the carbon they contain India has developed a pioneering national agroforestry policy. Suleman Merchant/ Shutterstock AgriKultuur |AgriCulture 36