Mother Nature: World Population Day falls on July 11, and its aim is to headline the challenges and advantages faced by a booming population. These include some big heavies aging, health, urbanization, mass migration, gender equality and education. This year's theme, "Vulnerable populations in emergencies," focuses on those most defenseless in a time of crisis, namely women, girls and youth. Think back to the earthquake that shook Nepal to its core a few months ago, or to the ongoing Syrian refugee crisis. People...