[{SlideShowNav}] !!!Optimistic Farming [{Image src='140wa.jpg' width='835' height='900' caption='Image courtesy of USGS. ' alt='Optimistic Farming' class='image_left'}] [{SET customtitle='Optimistic Farming'}] On the edge of the Kalahari Desert, sand dunes are encroaching onto once-fertile lands in the north. Healthy vegetation appears red in this false color satellite image; in the center, notice the lone red dot. It is the result of a center-pivot irrigation system, evidence that at least one optimistic farmer continues to work the fields despite the approaching sand.