The United Nations biannual population projections are some of the most (if not the most) widely used numbers in demography. Researchers and policymakers alike rely on the figures to plan for present and future challenges. But few consider the story behind the statistics. Where does the data come from? The United Nations Population Fund (UNFPA) recently released a short documentary on conducting censuses in challenging environments, with a spotlight on Indonesia, Chad, the Palestinian Territories, Belarus, and Bolivia.

Twenty-five years have passed since the Brundtland Commission first brought sustainable development to international prominence. Today, the United Nations appears on track to replace the soon-to-expire Millennium Development Goals with “Sustainable Development Goals,” marking the extent to which the international community has embraced the concept. And yet, in spite of its prominence, a specific and measureable definition of sustainability remains lacking.

The original version of this op-ed, by António Guterres, appeared in The New York Times.

For many people, Timbuktu has long represented the essence of remoteness: a mythical, faraway place located on the boundaries of our collective consciousness. But like many of the myths associated with colonialism, the reality is very different.

It’s not often that a change in accounting rules could reduce the probability of war. But that’s exactly what happened at the U.S. Securities and Exchange Commission (SEC) last month.

The original version of this article, by Jill Hagey, appeared on the Population Reference Bureau’s Behind the Numbers blog.

Over the past few months, the Sahel drought has sparked attention of news media and concerned citizens around the world. Throughout this media blitz, I have been struck by the sharp contrast between this coverage and how the devastating effects of malnutrition are usually portrayed. Malnutrition is often overlooked in favor of more “newsworthy” diseases, and it takes a crisis to focus our attention on this public health issue. Yet an emergency such as this drought – affecting more than 18 million people, including nearly 2 million children – is difficult to ignore.

August is a slow month in DC, but not so on New Security Beat: 8 of the top 10 last month (measured by unique pageviews) were new posts. Laurie Mazur’s discussion of inequality, population, and sustainability took the top spot followed by a look at what’s new in the Population Reference Bureau’s latest data sheet; Kate Diamond’s feature on Mongolia’s climate and development challenges; a discussion on the naming of the Failed States Index; a summary of the National Intelligence Council’s extensive series on aging; and two reactions to Iran’s surprising shift on family planning.

In 1979, Egyptian President Anwar Sadat famously said that “the only matter that could take Egypt to war again is water.” Sadat’s message was clear: the Nile is a matter of national security for Egypt.

Indeed, Egypt relies on the Nile for 95 percent of its water. But it is not the only state with an interest in the world’s longest river. There are 11 states in the Nile River basin, which stretches from Africa’s Great Lakes region – Tanzania, Uganda, Kenya, Rwanda, Burundi, and the Democratic Republic of the Congo – to the Ethiopian and Eritrean highlands through South Sudan, Sudan, and Egypt to the Mediterranean Sea.

The number of urban slum dwellers worldwide is staggering. According to UN-Habitat, 827.6 million people live in slums around the world. Despite meeting a Millennium Development Goal to significantly improve the lives of at least 100 million slum dwellers by 2020, the total number of people living in these areas still increased by 55 million between 2000 and 2010. By 2020, the world slum population is projected to reach 889 million. With the majority of people now living in cities, urban priorities are synonymous with human security and environmental sustainability and must be accounted for in the global development agenda.