Urbanization is both an opportunity and a challenge,” argued Christopher Williams from UN-HABITAT during a panel discussion at American University’s School of International Service. “Sustainable Cities: A discussion on the social, economic, and environmental strategies contributing to urban resilience” brought together sustainability experts to discuss innovative strategies for urban resilience in the face of the 21st century’s looming challenges.

Urbanization “is an opportunity in the sense that there’s a tremendous amount of innovation that’s going to take place with a concentration of ideas and economies and cultures in these urban spaces,” said Williams. “It’s a challenge in the sense that many of these cities are ill-equipped to handle this large influx of population.”

Williams outlined the principal challenges of an urbanizing world:

Celebrating World Health Day, the World Health Organization, with its partners around the globe, today launched an initiative for healthly lives in urban settings, through the theme “1000 Cities, 1000 Lives.” “We are at a critical turning point in history where we can make a difference,” said Dr Ala Alwan, assistant director-general for noncommunicable diseases and mental health.

Since the first World Health Day 60 years ago, the world has seen a dramatic rural exodus. Today, more people live in urban areas than anywhere else. Providing healthy livelihoods for the urban poor is a challenge, as poverty-stricken urban centers face a number of health obstacles, from high child mortality rates, environmental pollution, and widespread disease, to a lack of access to basic water, sanitation, and health care.

“In general, urban populations are better off than their rural counterparts,” said WHO Director-General Margaret Chan. “They tend to have greater access to social and health services and their life expectancy is longer. But cities can also concentrate threats to health such as inadequate sanitation and refuse collection, pollution, road traffic accidents, outbreaks of infectious diseases and also unhealthy lifestyles.”

The 1000 Cities campaign hopes to encourage all cities to promote healthy activities during the week following World Health Day (4/7-4/11). Through a new website, the WHO is collecting profiles and pictures in an easy-to-navigate map. Notable activities include HIV/AIDS-awareness flashmobs, skateboarding and cycling competitions, car-free days, outdoor sports events, and dance performances,  in cities as diverse as Mandalgobi, Mongolia; Bangalore, India; and Luanda, Angola.

The Wilson Center’s Environmental Change and Security Program and its Comparative Urban Studies Program have collaborated on urbanization events and publications that examine the strong and critical connections between healthy urban populations and environmental sustainability.

With proper attention paid to delivering population, health, and environmental services in our urban centers, it may be possible to leverage the benefits of higher urban densities—such as lower aid dispersion costs, communication access, infrastructure services, and fertile environments for ideas and productivity—to ensure urban sustainability for the future.

Foreign Policy’s Elizabeth Dickinson recently sat down with UN High Commissioner for Refugees António Guterres for a wide-ranging interview on the global refugee crisis. Yet a strong theme emerges across the continents: The complexity of today’s conflicts belies either easy or quick solutions.

Worldfocus recently featured two pieces on the Arab world’s burgeoning population. “Demographics of the Arab World,” a radio broadcast, brings together Magda Abu-Fadil of the American University in Beirut and Bernard Haykel of Princeton University for a look at the region’s demographic trends. Despite possessing different political systems and being at different levels of economic development, demographic challenges of youth bulges, emigration, and gender gaps are common to countries across the Arab world. “Arab World Experiences Rapid Population Explosion,” a written interview with demographer Patrick Gerland of the United Nations Population Division, tackles similar issues. Topics of discussion include demographic variations between Middle Eastern nations, fertility rates, the consequences of the region’s youth bulge, and best- and worst-case scenarios for the Arab world’s future.

The journal Nature Geoscience recently published a study comparing the impacts of rural and urban population growth on deforestation. “Deforestation Driven by Urban Population Growth and Agricultural Trade in the Twenty-First Century” finds deforestation is positively correlated with urban population growth and agricultural exports to international markets. In rural areas, however, the link between deforestation and population growth was absent, indicating that urbanization and agricultural export-oriented economies were the primary drivers for forest loss. The study concludes that, rather than focusing on the activities of rural populations, deforestation reduction efforts should target “industrial-scale, export-oriented agricultural production, concomitant with efforts to increase yields in non-forested lands.” (SUBSCRIPTION ONLY)

For students, looking at national security through the lens of demography can be challenging and frustrating, says Jennifer Dabbs Sciubba, a Mellon Environmental Fellow and professor at Rhodes College. “You really have to start at the beginning and explain the fundamentals of, ‘What is population in the first place?’” she told ECSP Director Geoff Dabelko of her undergraduate courses on population-environment and population-security connections.

Two articles in the Sunday New York Times revealed that some residents of Mexico City and Charleston, West Virginia, share a common bond: lack of clean water. While drought and leaks have drained Mexico City’s reservoirs, pollution and run-off from coal plants has befouled water supplies in West Virginia’s small towns. But in both cases, the less powerful are the ones stuck up the creek without a paddle.

On Monday, California became the first U.S. state to issue a report outlining strategies for adapting to climate change. Among other recommendations, it suggests that Californians should consider moving.