As the world rushes to reduce the negative impacts of climate change, ambitious sub-national actors are rising to the fore. The recent One Planet Summit exemplifies this trend. Earlier this month…

Prashant Kapoor, Marc Forni |

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 |

​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 |

For the first time in history, the number of people living in extreme poverty has fallen below 10%. The world has never been as ambitious about development as it is today. After adopting the…

Sri Mulyani Indrawati |

Over the past decade, illegal poaching of wildlife has quickly caught up to habitat destruction as a leading cause of wildlife loss in many countries.   Poaching African elephants for ivory…

Samuel Wasser |

The challenge of moving from conflict and fragility to resilience and growth is immense. More than half of the countries counted as low income have experienced conflict in the last decade. Twenty…

Laura Ralston |

Only a very short time ago, we were drawing blank looks when we mentioned "natural capital accounting." This week at Rio, everyone is talking about it. Walls are plastered with flyers…

Rachel Kyte |

At the December 2009 Copenhagen climate change conference, Saad Hariri, then Prime Minister of Lebanon, announced his country’s new target for renewable energy: 12% of the national energy mix, to…

Christopher Neal |