​Today, a quarter of the world’s population lives in urban “agglomerations”—supersized metropolitan areas that cut across jurisdictional boundaries and bring together one or more cities along with…

Ede Ijjasz-Vasquez, Philip E. Karp, Maria Angelica Sotomayor |

Building earthquake-resistant housing in Peru. Photo: USAID/OFDA, Auriana Koutnik/Flickr When a hurricane, earthquake or other natural disaster strikes a poor country, families too often suffer a…

Luis Triveno, Niels Holm-en |