In July, thousands of people attended the 20th International AIDS Conference and the 2014 Girls Summit to work towards an AIDS-free generation and ending child and forced marriage. But such attention is rare; by and large, these girls are invisible to development efforts. [Video Below]

Under international law, someone who flees their country because of conflict or persecution is a refugee, but someone who flees because of inability to meet their basic household needs is not. In the case of Somalia, it is increasingly difficult to make any meaningful distinction between the two.

“You can’t build a peaceful world on an empty stomach,” Secretary of State John Kerry said yesterday at a high-level working session on resilience and food security, quoting Norman Borlaug, the father of last century’s “Green Revolution.”

As global environmental change accelerates, understanding how population dynamics affect the environment is more important than ever. It seems obvious that human-caused climate change has at least something to do with the quadrupling of world population over the last 100 years.

In March, the Intergovernmental Panel on Climate Change released its latest comprehensive synthesis of climate change research. The report concludes that “impacts from recent climate-related extremes, such as heat waves, droughts, floods, cyclones, and wildfires, reveal significant vulnerability and exposure of some ecosystems and many human systems to current climate variability.”

“Population is critical to thinking about sustainability and human wellbeing, and how we live and subsist on the planet,” says ECSP’s Roger-Mark De Souza on this World Population Day.

My grandmother was pleased when I told her I was heading to Ethiopia last November for an international conference focused on population, health, and the environment.

When she finished her dissertation on migration as a response to climate change in 2003, it was one of only a handful of scholarly papers published on the topic that year, said Susana Adamo, an associate research scientist at Columbia University’s Center for International Earth Science Information Network. But in the decade since, interest in climate migration has exploded – in 2012, more than 10 times as many papers were published. [Video Below]