We already know that the world's farms have more tree cover than believed, but a little more couldn't hurt. The fact is that incorporating trees and perennial crops into food growing can be crucial way to fight drought and improve soil stability. Permaculture Magazine has a great article on the BusyTrees campaign (part of the UN's International Year of Forests), which explains why agroforestry is literally a life saver in some parts of the world:
"Faidherbia is a nitrogen-fixing acacia that improves the soil while providing good shade for poor farmers' young maize seedlings early in their growth when they need it most," explains Paul Stapleton from the World Agroforestry Centre. "But the tree sheds its leaves in the rainy season, which means that maize crops grown with Faidherbia get the maximum sunlight when they mature - just when they need."
Of course, given the sinister conspiracy of Agenda 21, we should be careful to look beyond nitrogen-fixing tree cover to whatever it is that the UN is really planning (besides banning our light bulbs). But in the meantime, check out BusyTrees to learn more about the amazing potential of agroforestry.