EcoWatch: The world has lost almost half of its original forest cover, due largely to booming population growth and agricultural expansion. But even though these forests are gone, there is still a tremendous amount of underutilized and unproductive land that has the potential to provide valuable ecosystem services if trees are returned to the landscape. Clean water, improved soil fertility and income from forest products are just a few of the services that these lands, once restored, could provide. So where…