Homelessness was once considerably less visible. In 1950, for example, 70% of the world’s population of 2.5 billion was spread out across rural areas. Today, 55% of the world’s population of 7.6 billion is concentrated in urban centers. Although definitions vary across countries, it’s estimated that no less than 150 million people, or about 2% of the world’s population are homeless. However, about 20% of the world’s population may lack adequate housing. (http://bit.ly/2BgsrmQ)