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]

Rapid population growth can be a contributing factor to climate change vulnerability and should be considered in climate adaptation and peacebuilding efforts, said the Wilson Center’s Roger-Mark De Souza at a workshop on climate change adaptation and peacebuilding hosted by the Institute for Security Studies (ISS) in Addis Ababa.

Will climate change cause conflict? That question, which has sparked heated debates in academia and the media, resists simple answers. But is climate change already contributing to conflict in some places? If so, how exactly? And more importantly, what should be done about it? These questions were the focus of a 2013 preliminary report produced for USAID by international development firm Tetra Tech ARD, which examines the climate-conflict nexus in Uganda, Ethiopia, and Peru.