In South Africa, a tale of two cities dominates a society burdened by massive inequality. Now a water crisis is driving the wedge further.<br />The city of nearly 4 million is on the cusp of becoming the first modern metropolis to run out of the natural resource.<br />Environmental conditions have threatened Cape Town. They have sent millions into a panic.<br />In 2010, the United Nations "recognized the human right to water and sanitation. <br />
