Since the end of World War II, a number of the world’s most dramatic political events have resulted from demographic shifts and governments’ reaction to them. Despite this, political demography remains a neglected topic of scholarly investigation.

“The greatest challenge we have today is that we have a world that is pushing back on rights,” said Dr. Babatunde Osotimehin, executive director of the United Nations Population Fund (UNFPA), at the Wilson Center. [Video Below]

The original version of this article, by Lisa Palmer, appeared on Future Food 2050.

As a boy growing up on the shores of Lake Victoria in Kenya, Harvard international development professor Calestous Juma noticed a thing or two about innovations designed to bring more food into his community. He noticed, for instance, that the fishermen were always tinkering with new ways to trap fish while his father, a carpenter, would build the traps. He also noticed that his grandmother, a peanut grower, and other farmers who grew traditional crops such as sweet potatoes, struggled with ways to increase production beyond simply planting the best quality seeds and tubers.

World Population Day began in 1987 after public imagination was sparked by the idea that there could be 5 billion people on Earth. Today, we’re well past 7 billion and according to the latest UN projections, headed north of 9 billion by mid-century.

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.

“Saving the planet depends on women achieving full human rights, and that begins with reproductive rights,” writes the Natural Resources Defense Council’s Frances Beinecke in a new set of essays on reproductive health published by the United Nations Foundation and the Aspen Institute.