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Population growth 鈥渋s highly concentrated in what are today the  and  areas of the world,鈥� said George Mason University professor Jack Goldstone at the 乐鱼 体育 on December 5.

Goldstone was joined by Suzanne Ehlers, president and CEO of  (PAI), and Matthew Erdman, population-health-environment technical advisor at , to discuss the implications of seven billion people and counting for the environment as part of the joint 乐鱼 体育-George Mason University Managing the Planet series.

Concentrated Growth

At a global level, Goldstone said, population growth doesn鈥檛 look very severe. Growth rates have declined precipitously over the last few decades, especially in western countries. 鈥淗owever,鈥� he said, 鈥渢hat kind of complacency can be very, very dangerous because there are population trends buried in those aggregate figures that really deserve our attention.鈥�

Despite declining fertility rates, world population is still projected  by 2050, according to the UN. Part of that growth is explained by demographic momentum: since young people make up the biggest demographic cohort in history, population growth will continue even if individual young people choose to have fewer children. But there are also  around the world who lack access to voluntary family planning.

Much of the growth will be concentrated in a few regions: sub-Saharan Africa, South Asia, and parts of Latin America and the Middle East. To illustrate the magnitude of growth in Africa in particular, Goldstone took a closer look at the projections for , , Niger, , and . According to the , which assume reductions in total fertility and increases in contraceptive prevalence, the populations of each of these countries ; in Niger and Tanzania, they will more than triple.

鈥淏ut if we go out another half century, the numbers truly get prodigious,鈥� Goldstone said. Nigeria鈥檚 population of 158 million today could reach  by 2100, he pointed out. If , Nigeria鈥檚 population could swell to over a billion people by 2100, according to the UN鈥檚 high projection.

Goldstone also examined two other demographic trends that will shape the future of the planet: urbanization and the growing global middle class.

In 2010, the world population shifted from predominately rural to  for the first time in history. Urbanization is only projected to continue growing, said Goldstone. Overall global urban population will increase by about 75 percent by 2050, faster than the baseline global population growth of about 25 percent. This trend has consequences for the environment as  can put a greater strain on natural resource, especially since most of the urban growth will take place in developing countries which may not have the capacity to support it.

Further, as more and more people leave poverty for the middle class 鈥� a trend that often goes hand-in-hand with moving to the city 鈥� they will consume more and more, further straining the world鈥檚 resource base. 鈥淧overty is a tragedy,鈥� said Goldstone, 鈥渉owever, overcoming poverty generally requires considerable increases in energy and material consumption,鈥� which is bad news for the environment.

There is still time to avoid the negative consequences of . Goldstone suggested that encouraging and helping developing countries model their growing urban areas after more compact European cities, as opposed to the car-centered American suburbs, can help reduce their environmental impact. And empowering women to 鈥� over their families and over their bodies鈥� can help lower fertility and lead to more productive societies as more women enter the workforce.

Still, Goldstone was far from optimistic: 鈥淔or the past 30 years in which I鈥檝e been reading and talking and researching these topics, we have largely neglected to do anything about the consequences of rising consumption, rising urbanization, rising energy use with regard to climate change, and patterns of human residence and vulnerability.鈥�

Linking Population with Conservation

Like Goldstone, Suzanne Ehlers broke the global projections down to regional levels. Specifically, she focused on areas of great biodiversity.

鈥淢any places around the world that are the most ecologically diverse are also experiencing the most population pressure,鈥� she said. 鈥淎nd the majority of global biodiverse hotspots, as the  group defines it, are located in developing countries. Population growth rates in these areas are higher than those of the world overall, and higher too than the average rate in developing countries 鈥� not by a huge margin, but by an important margin.鈥�

She also built on Goldstone鈥檚 point about empowering women. Population is 鈥渁bsolutely opportunity and not destiny,鈥� she said. There are pockets of great unmet demand for reproductive health services, and.

PAI has a mapping effort which combines overlays of agricultural production, water scarcity, resilience, population, temperature, precipitation, soil moisture, unmet need for family planning, and biodiversity. These help show hotspots of vulnerability and also demonstrate that 鈥減eople鈥檚 lives are interdisciplinary,鈥� said Ehlers.

鈥淵et most funding mechanisms, from private foundations to government bilaterals, across the board, tend to work in silos according to sectors,鈥� she continued.  (PHE) projects are one set of interventions, though, that are helping to address these issues in an integrated fashion.

鈥淧HE groups came about largely through demand  were seeing in the field,鈥� Ehlers said. These groups 鈥渨omen and families wanted to participate in conservation efforts, but they also needed to have their health needs met, and they also needed to have their contraceptive needs met in order not only to have the family size that they wanted but in order to live in a sustainable way.鈥�

Conservation groups found that combining health, livelihood, and environmental interventions improved the lives of both people and their environment.

Ehlers stressed that in order to address many of the environmental challenges caused by population growth, there is a continued role for organizations in donor countries to emphasize an integrated approach to development and conservation. Though , a number of obstacles remain to scaling up, both in policy and in funding, she said; the work of PHE organizations is 鈥渇ar from done.鈥�

PHE in Madagascar

Before recently joining USAID, Matthew Erdman worked for , an organization implementing .

In Madagascar鈥檚 remote villages, when families aren鈥檛 healthy, they have a large number of children, he said, expecting only a few to survive. Large families require more resources and depletion of these resources means the environment cannot support healthy families. In contrast, he said they found that by helping families improve their own health, a 鈥渧irtuous cycle鈥� is created of smaller family sizes and a healthier environment.

While PHE can be effective in many places, Erdman suggested it is particularly well-suited to areas of high biodiversity. 鈥淚n these areas of high biodiversity, people tend to be much more dependent on their local environment for natural resources such as food, water, building materials, fuel, trade, and so these resources are becoming more and more scarce as these populations continue to grow at a rapid rate.鈥�

In Madagascar, the communities they worked were entirely dependent on the sea. 鈥淭here were very few alternative livelihood solutions,鈥� Erdman said, 鈥渢he only thing you could do to make money was to fish.鈥�

Population growth therefore put great pressure on marine resources, to the extent that , originally a marine conservation organization,  into health and family planning. By training community health workers to disperse contraception, use of family planning increased from 9 to 40 percent in just five years.

Erdman said that USAID has found under certain conditions that PHE projects, like Blue Ventures, can be more effective than development efforts that target only one sector at a time. 鈥淭his integrated approach often yields  for each sector while at the same time contributing towards a common goal, in this case conservation and development.鈥�

Focus on Rights, Livelihoods

The panelists agreed that the track that global population takes over the next few decades has serious ramifications for the environment.

鈥淵ou can say, 鈥楬ey, that鈥檚 a  into a deeply long and uncertain future; things may not work out like that, why should we be concerned?鈥欌�� said Goldstone. But he noted that population projections depend on many factors that are already established. 鈥淢any of the people who will be alive in 2050 are already alive today.鈥�

Erdman suggested maintaining a focus on individual livelihoods in discussions about demography. 鈥淭oday鈥檚 children are tomorrow鈥檚 parents,鈥� he said. If their needs aren鈥檛 addressed, 鈥測ou鈥檙e setting the stage for rapid, rapid population growth.鈥�

Ehlers agreed, saying that much depends on holistically supporting the choices and rights of  today. An integrated approach like PHE can more effectively address the challenges of the future, she said. 鈥淐ross-sector collaboration that knits together strong, sustainable, and inclusive social change movements at the national level is really the only way to go.鈥�

Sources: Blue Ventures, Conservation International, Population Action International, UN Population Projections.

Photo Credit: ; Chart Credit: Population Action International.