Farms and Tree Cover

Headlines from a press release at the 2nd World Congress of Agroforestry state "almost half worlds farms have significant tree cover." Reading further we see study "found that about 10 million square kilometers of agricultural land have at least 10 percent tree cover."  This was done via remote sensing so it is probably good science. 10% ain't bad at all.  The questions are what role they are playing in the landscapes and a policy implications of the study - as one of the interviewee in the press relase succintly states:

'"The problem is that policymakers and planners have been slow to recognize this phenomenon and take advantage of the beneficial effect of planting trees on farms. Trees are providing farmers with everything from carbon sequestration, to nuts and fruits, to windbreaks and erosion control, to fuel for heating and timber for housing. Unless such practices are brought to scale in farming communities worldwide, we will not benefit from the full value trees can bring to livelihoods and landscapes."