“Right now, half the world’s population – some 3 billion people – are under the age of 25,” began Laurie Mazur on the “Population, Climate, and Consumption” panel at the Society for Environmental Journalists 20th Annual Conference. “It’s the largest generation ever that’s coming of age, and the choices that those young men and women make about childbearing will determine whether world population…grows to anywhere between 8 and 11 billion by the middle of this century.”

“The good news is that everything we need to do to slow population growth is something we should be doing anyway,” she continued. Mazur is the author of A Pivotal Moment: Population, Justice, and the Environmental Challenge and director of the Population Justice Project.

She was joined on the panel by Brian O’Neill, who spoke about a new study examining the impact of demographics on carbon emissions, and Jack Liu, who spoke about the impact of household size on emissions in China.

The “Pop Audio” series offers brief clips from ECSP’s conversations with experts around the world, sharing analysis and promoting dialogue on population-related issues. Also available on iTunes.

“Slower population growth would not solve the climate problem, but it could make a contribution. It is neither a silver bullet nor a red herring,” said Brian O’Neill of the National Center for Atmospheric Research at the annual Society of Environmental Journalists’ conference in Missoula, MT. On Friday, he presented the results of a new demographic study as part of a panel, “Population, Climate, and Consumption,” moderated by Ken Weiss of the Los Angeles Times.

A new study, “Global Demographic Trends and Future Carbon Emissions,” finds that slowing population growth by 2050 would meet 16-29 percent of the reductions in carbon emissions necessary to avoid dangerous climate change — roughly equivalent to 1-1.5 “stabilization wedges.” Published in PNAS this week, the article reports the results of a comprehensive assessment, led by Brian O’Neill of the National Center for Atmospheric Research (NCAR), of the impact of demographic changes, including urbanization and aging, on global carbon emissions.

Excerpt from a First Take by Gayle Tzemach Lemmon at the Council on Foreign Relations:

Ten years after global leaders vowed to work toward eradicating extreme poverty, achieving universal primary education, reducing child mortality, and more, the eight Millennium Development Goals (MDGs) – particularly those relating to women – remain a distant hope. Though women were a focus of much discussion this week at the MDG summit in New York, the forward movement so far has been discouraging on the two MDGs directly relating to women: “promoting gender equality and empowering women” and “reducing by three-quarters the maternal mortality ratio.”

An MDG report released in June noted that when it comes to women, “progress has been sluggish on all fronts – from education to access to political decision-making.”

There are two Latin Americas according to demographers. In one of the most urbanized regions of the world, the population of some countries remains highly rural. While countries like Chile, Argentina, and Uruguay are close to 90 percent urbanized, much of Central America, as well as Ecuador, Paraguay, and Bolivia, are only about 50-60 percent urban.

Across the continent, Latin America’s total fertility rate has fallen from almost six children per woman in the 1960s to 2.2 children in 2005. Population growth rates are projected to continue to decline from 1.5 percent in 2010 to roughly 0.75 percent by 2020. But less-urbanized countries continue to experience high population growth in their rural areas, particularly among their large indigenous populations, who are not experiencing the same shifts from high to low fertility.

For example, since 1990, communities surrounding Guatemala’s Sierra de Lacandon National Park have grown by 10 percent each year, with birthrates averaging eight children per woman. These larger communities and households have led to agricultural expansion into the park, which has lost 10 percent of its forest canopy since 1990.

Rural-to-rural migration is also a key, but often overlooked, dynamic as migrants move to other rural areas in search of new land to farm. Between 1961 and 2001, Central America’s rural population increased by 59 percent. This increased population was accompanied by a 15 percent increase in deforestation, totaling some 13 million hectares.

Although many rural areas of Latin America have high fertility rates and expanding populations, they also have a high unmet demand for contraception. Indigenous populations are particularly underserved by health providers for many reasons, including cultural barriers, language, and accessibility. According to the Population Reference Bureau, an estimated 50 percent of indigenous women in the Ecuadorian Amazon do not want another child, yet 98 percent of them do not have access to a modern contraceptive method.

While reaching historically disadvantaged populations in rural communities is not easy, some programs have had considerable success—and saved money—by combining environmental and health efforts. For example, the Guatemalan NGO ProPeten trained more than 80 midwives and health promoters and developed a radio soap opera in both Spanish and Q’eqchi’ to deliver health services and environmental education to the communities living near the Maya Biosphere Reserve.

Given links between rural population growth and agricultural expansion, expanding access to family planning may not only be a cost-effective way to help women reach their desired family size, but also a smart investment in forest conservation and climate mitigation—and perhaps a down-payment on a more secure future for all.

“I’m thrilled to be back.” That was the sentiment that Roger-Mark De Souza relayed to me, in his famous lilting baritone, about becoming the new vice president of research and director of the climate program at Population Action International (PAI). De Souza has long been a leading voice on integrated development programs that feature population, health, and environmental (PHE) dimensions. But three years as the Sierra Club’s director of foundations and corporate relations took him away from day-to-day work on these issues.

In his new posts, Roger-Mark will lead PAI’s research team in establishing a strong evidence base and engaging new allies in the effort to support healthier women and families, according to PAI. “Roger-Mark’s diverse research experience makes him an ideal fit for PAI as we undertake critical projects on reproductive health, population and environment issues,” said PAI President and CEO Suzanne Ehlers in a press release.

“We have now found the weapon of mass protection,” said Mechai Viravaidya (a.k.a. the “Condom King”) at the recent TEDxChange event in New York. Viravaidya is the founder and chairman of the Population and Community Development Association and a former senator of Thailand. He spoke about his innovative approaches to addressing Thailand’s once high rates of poverty, child mortality, and HIV through the promotion of family planning and condom use.

Excerpt from op-ed by Huma Yusuf in Dawn:

The best news Pakistanis have received in the past week comes in the form of the National Population Policy 2010. The policy recognises that demographics are the key to promoting economic development and security in Pakistan. It also prioritises family planning — particularly in an effort to promote birth spacing — as the best strategy for achieving ambitious population targets (2.1 births per woman in 2025).

In many ways, the story of Pakistan is one of a failure of family planning. Although the Family Planning Association of Pakistan was set up as early as 1952, we have seen a five-fold increase in our population between 1951 and 2009, from 34 million to 171 million.