On any rational cost-benefit basis, investing in preparedness, whether for pandemics or natural hazards, is possibly one of the best investments any country can make. A dollar spent on…

Abhas Jha |

As the world observes World Environment Day this week, we should be mindful that [[tweetable]]there will be more plastic in the oceans than fish by 2050 if nothing is done[[/tweetable]], according…

Silpa Kaza, Lisa Yao |

As the world becomes increasingly urbanized, the number of megacities is growing rapidly. Today there are 37 cities worldwide with populations of greater than 10 million, and 84 with populations…

Philip E. Karp, Peter Ellis, Barjor Mehta |

[[tweetable]]How fast is your city growing? The answer may depend on where you live.[[/tweetable]] There are the booming megacities such as Tokyo, Mumbai, and Nairobi. Then there are cities that…

Ede Ijjasz-Vasquez, Paula Restrepo Cadavid |

​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 |

  When we think of urban expansion in the 21st century, we often think of ‘sprawl’, a term that calls to mind low-density, car-oriented suburban growth, perhaps made up of single-family homes.…

Chandan Deuskar |