Ancient cities, like Mohenjodaro in modern-day Pakistan, emerged relatively recently in human history (photo courtesy of Saqib Qayyum used through a Creative Commons license.)​ The growth of large…

Chandan Deuskar |

Also available in Français | Español | 中文 In January, World Bank Group President Jim Yong Kim urged the audience at the World Economic Forum in Davos to look closely at a young, promising form of…

Heike Reichelt, Alexandra Klöpfer |

It’s 38°C (99°F) in Ouagadougou, the capitol city of Burkina Faso, today—and it’s been this hot all week. The end of the warm season is near, but in places like Ouaga (pronounced WAH-ga, as its…

Paul Brenton, Miles McKenna |

The Nigerien city of Gaya is booming. Sitting on the banks of the Niger River not far from the borders of Benin and Nigeria,  Gaya has grown from a quiet village to a hopping new hub. Its…

Anasuya Raj, Jean-François Arvis |

In September, the world’s top scientists said the human influence on climate was clear. Last month, they warned of increased risks of a rapidly warming planet to our economies, environment, food…

Rachel Kyte |

Up until recently, if someone asked us what the most important benefits of solid waste management were, we would have said improving public health, reducing greenhouse gas emissions, or helping…

Silpa Kaza, Farouk Banna |