Population projections undergird many important policy decisions, from the U.S. government’s Feed the Future program to the Sustainable Development Goals. But they’re not as straightforward as they appear. Demographers often base their estimates on complicated assumptions that aren’t obvious to the end user.

As climate change upends established patterns of life, resilience – the ability of social and ecological systems to mitigate, endure, and adapt to short-term shocks and long-term stressors – has become a buzzword in development and humanitarian circles. [Video Below]

Climate change and conflict – what’s the relationship? In a recently completed set of field-based studies for USAID, the Foundation for Environmental Security and Sustainability set aside “yes-or-no” questions about whether climate change causes conflict and replaced them with pragmatic and politically informed questions about how climate change is consequential for conflict in specific fragile states.

The potential security challenges linked with climate change can make for great headlines. While sensationalist claims about water wars, states collapsing in chaos, or the forced migration of hundreds of millions cannot be completely discounted for the long term, intelligent mitigation and adaptation efforts can help avoid the worst of these – and manage the rest.

One-third of boys in the developing world don’t face the risk of marriage and pregnancy before age 18. There are no laws preventing men from owning land or property. Men don’t bear the brunt of increasingly frequent and severe disasters. And men don’t hold fewer than 25 percent of parliamentary seats worldwide.

Mass displacement has become a significant feature of recent conflicts, as the number of people forced to flee their homes has passed 50 million worldwide, a level not seen since World War II. This is one of the reasons why the UN Security Council will focus on women refugees and internally displaced persons (IDPs) during its annual open debate on women, peace, and security on October 28, according to Elizabeth Cafferty, senior advocacy officer at the Women’s Refugee Commission.

By 2045, global population will be north of 9 billion with increased urbanization and migration, natural resource stress, improved medical technologies, greater use of robotic labor, and a shift towards lifelong (and increasingly online) learning, according to a recent report from the UK Ministry of Defense.

In August, armed men stormed an Ebola clinic in Monrovia, Liberia, releasing infected patients and stealing contaminated bedding. The following month, eight health workers were attacked and killed in a Guinean village as they tried to educate residents about the deadly disease; their bodies were found in a village latrine. Days later, Red Cross workers in western Guinea were assaulted as they tried to collect and bury Ebola victims.