[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/images/11/09/art.amanpour.writer.jpg caption="Sr. Writer Tom Evans"] On AMANPOUR. today, we will be looking at the global competition for an increasingly scarce resource, water.  Countries such as Yemen are suffering from critical water shortages. By some estimates water scarcity affects one in three humans on the planet. Even parts of the United States are suffering from … Continue reading Tom's Take: