As the largest-ever generation of young people enters adulthood, armed conflict is having a profound effect on their future. People under the age of 24 comprise nearly half the world’s population but are the primary participants in conflict today. Conflict is more prevalent in younger societies, and half of all forcibly displaced people are children.

Last year, the International Committee of the Red Cross (ICRC) celebrated 150 years of their mission to “protect the lives and dignity of victims of war and internal violence.” Though this mission hasn’t changed in the past century-and-a-half, the nature of conflict and crisis response has. [Video Below]

In the wake of natural disasters, the idea that systematic change might be needed to prevent future crises often takes a backseat to restorative efforts. But as disasters become more common, there is often a blurring of disaster response and development initiatives.

Today approximately 44 percent of the world’s 7.2 billion people are under 24 years old – and 26 percent are under 14. Of those 7.2 billion people, a staggering 82 percent live in less developed regions of the world – primarily sub-Saharan Africa and Asia. Currently, the global median age is 29.2 years old, a sharp contrast to Europe, for example, where the median age is 41.

Sub-Saharan Africa is not only the fastest growing region of the world demographically but is also one of the most vulnerable to climate changes, according to many measures, and already facing natural resource scarcity in many areas. These factors combine with existing development challenges to create security threats that African governments and the United States should be concerned with, says ECSP Director Roger-Mark De Souza in a presentation for the Africa Center for Strategic Studies’ introductory course on demography and the environment at the National Defense University.

“The places in the world where the environment is most fragile, women’s health is most fragile,” said Leila Darabi, director of global communications for the Planned Parenthood Federation of America, at the Wilson Center. “The negative impacts on the environment tend to affect women the most. Women are the people who are planting kitchen gardens, women are traditional healers, and so they often feel the impact first when those things are degraded.”

The Wilson Center Policy Briefs are a series of short analyses of critical global issues facing the next administration that will run until inauguration day.

Seven billion people now live on Earth, only a dozen years after the global population hit six billion. But this milestone is not about sheer numbers. Demographic trends will significantly affect the planet’s resources and people’s security.