I think that the answer is a resounding YES!  But we need modern science and modern technology. We need to “professionalize” farming. We need to redesign agriculture as an integrated system of land, water, nutrients and energy. We need to apply much more sophisticated thinking and planning to the sustainable use of land, invent better irrigation and fertilization techniques, manage and recycle nutrients on a much larger scale.  We need to farm in cities on rooftops for cooling, heat management, and to decrease transportation costs for fresh produce that is largely water.  And we need to think out of the box: new technology, new crops, new land, new water resources.