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.

“Half of the world’s population is under 30 – any development agenda would have to address their needs, including their health needs, as part of accomplishing development goals,” said Jennifer Adams, deputy assistant administrator at USAID’s Bureau for Global Health, at the Wilson Center on September 24. [Video Below]

Seasoned demography geeks know to anticipate the release of the UN Population Division’s World Population Prospects in the spring of odd-numbered years. An off-cycle update published last month in Science, summarizing new results and methodological changes to the projections, therefore provoked a buzz of interest and a mini-flurry of media coverage.

The United Nations and the streets of Manhattan are going into global warming saturation mode, from Sunday’s People’s Climate March through the Tuesday climate change summit convened by Secretary General Ban Ki-moon and on through an annual green-energy event called Climate Week.

An estimated 1.8 billion people today are between the ages of 10 and 24 and 85 percent of them live in developing economies and/or fragile states. Such youthful age structures can lead to a number of challenges, including increased potential for instability, and countries with large numbers of young people must find ways to address their unique needs.

Amid stop-and-start ceasefires, the tally of death and destruction from the recent conflict in the Gaza Strip has begun. Whatever the final losses incurred – casualties and damage are considerable with estimates varying significantly depending on the source – Gaza’s youngest residents are likely to be most profoundly affected.