“The ultimate weapon of mass destruction—and perhaps of economic destruction—is the testosterone molecule,” quipped Malcolm Potts at the February 11, 2009, discussion of his new book, “Sex and War: How Biology Explains War and Offers a Path to Peace,” which explores the pivotal question, “Why do human beings systematically and deliberately kill our own species?” Potts, the Bixby Professor of Population and Family Planning at the University of California, Berkeley, was joined Science magazine’s Ann Gibbons, a leading correspondent on human evolution, who examined whether aggressive human behaviors are evolving in response to changing social structures.

Testosterone: Risky Business

“In 1987, some anthropologists and sociologists made a statement at UNESCO that it is scientifically incorrect to say we’ve inherited a tendency to make war from our animal ancestors,” said Potts. “I think that that is wrong.” Evolutionary psychology suggests that humans have inherited certain predispositions that “help us adapt to find food, select mates, avoid danger, and compete for resources in a hostile world,” said Potts. Men compete for women, so it is logical, from a reproductive standpoint, that men would take more risks than women, he argued.

In addition, “there’s strong evidence that there is a genetic tendency for men in the prime of life to attack and kill their neighbors,” Potts noted, while emphasizing that this does not mean that men are preordained to fight one another. “Such predispositions are extraordinarily flexible,” and respond well to peaceful cultural norms.

The Pill Is Mightier Than the Sword

“Once we recognize our violent origins, then we need to ask not ‘why do wars break out?’ but ‘why does peace break out?’” posed Potts. “Judged on the basis of same-species killing,” the violent 20th century may have been the most peaceful in human history, he claimed.

“In the whole of recorded history, I cannot find a single example of women banding together spontaneously and then going out to attack a neighboring group,” maintained Potts. He argued that increasing women’s individual freedom and collective power in civil society and government is the best way to achieve a more peaceful world. More specifically, slowing population growth and promoting more balanced age structures by giving women access to family planning will contribute not just to their own autonomy, but also to long-term peace, he argued.

Evolving To Become Less Aggressive?

“Humans are capable of incredible acts of kindness but also despicable acts of terror,” said Gibbons. “We murder, slaughter, barbeque, and even eat our own species, and we’ve been doing it for a long time.” But it is difficult to determine whether this propensity for aggression is an ancient trait or has more recently evolved. “There are no other human species alive to show us different models for male aggression…so we have look at fossils, DNA, and our closest relatives—the chimpanzees and gorillas,” Gibbons said.

Human aggression may be continuing to evolve. As Gibbons explained, “researchers, as they look at the human genome project—the HapMap Project—have discovered there are many, many genes that have come under natural selection that have evolved in the last 100,000 years, since modern humans spread out of Africa.” Therefore, as warfare becomes less necessary to our daily survival, our species might evolve to become less aggressive. “Are we seeing, in our sexual selection, mates being chosen that are a little less aggressive?” Gibbons asked. “We are still evolving,” she emphasized. “The story isn’t over yet.”

Photos: From top to bottom, Malcolm Potts and Ann Gibbons. Courtesy of Dave Hawxhurst and the Woodrow Wilson Center.

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A new study published in Conservation Biology (abstract) calculates that more than 80 percent of major armed conflicts from 1950-2000 have taken place in one of the world’s 34 biodiversity hotspots. “The fact that so many conflicts have occurred in areas of high biodiversity loss and natural resource degradation warrants much further investigation as to the underlying causes, and strongly highlights the importance of these areas for global security,” says coauthor Russell A. Mittermeier. He and lead author Thor Hansen argue that protecting nature during war can help recovery, and call for integrating conservation “into military, reconstruction and humanitarian programs in the world’s conflict zones.”

If you’ve visited Rwanda, chances are you’ve seen the country’s famous mountain gorillas in Volcanoes National Park. The endangered gorillas are such a national treasure that the ceremony when each year’s baby gorillas are named is a huge public event. Yet most foreign tourists never visit the country’s other attractions, which include Akagera National Park in the east and Nyungwe National Park in the southwest.

Destination Nyungwe Project (DNP), which I visited yesterday with the leaders of the East Africa PHE Network, is trying to change all that. It envisions Nyungwe National Park becoming a world-class tourist destination, and improving the livelihoods of the local people in the process. In fact, as project director Ian Munanura sees it, ensuring the park benefits local communities is a necessity, not a luxury. It’s fine to tell people not to cut down trees in the forest, or not to poach endangered animals, but they will continue these activities unless they have another way to make a living.

Nyungwe has a lot to offer; as the largest montane rainforest in Africa, it boasts 13 species of primates, including chimpanzees and colobus monkeys, as well as nearly 300 species of birds. It also has a relatively well-developed network of hiking trails. DNP is working on several projects intended to boost the park’s tourism appeal, including an interpretive visitor center, high-end tented campsites, and a rainforest canopy walk on a bridge suspended between two towers.

As these larger projects are constructed, DNP—which is funded by the U.S. Agency for International Development and implemented by International Resources Group, Family Health International, and the Wildlife Conservation Society—is also working to improve the health, livelihoods, and environmental management of the local communities. A health coordinator works with local clinics to improve maternal and child health, family planning and reproductive health, and hygiene. Health and family-planning activities are key to ensuring the park’s survival because high population growth, and the resulting demand for land, is one of the key threats to the park, says Munanura. A small-grants program provides micro-loans to local people for sustainable livelihoods, such as setting up cultural tourism attractions or producing soap, lotion, and oils from forest products.

Nyungwe National Park still struggles to attract tourists, as it lacks the luxury accommodations offered at Volcanoes National Park. But according to Munanura, 80 percent of visitors to Nyungwe hear about it through word-of-mouth, suggesting that those who do visit are extremely satisfied with their experience. These visitors would probably be even more satisfied knowing that their vacations were helping communities escape from poverty and disease. We will be following the progress of this innovative project with interest.

Rachel Weisshaar is attending the meeting of the East Africa PHE Network in Kigali, Rwanda. She will be posting daily updates on the New Security Beat throughout the week (see days one and two).

Photo: Nyungwe National Park, Rwanda. Courtesy of Rachel Weisshaar.

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“Demography will have a greater role in defense planning in the future,” says Jennifer Dabbs Sciubba in this short video preview of her article, “Population in Defense Policy Planning,” now appearing in the 13th issue of Environmental Change and Security Program Report. “Robert Gates has put a lot of emphasis on development as a key to peace, and Africa Command may be the area that brings together issues of demography, the environment, and development, and sends those observations back up the higher levels at DOD,” she observes. Sciubba, Mellon Environmental Fellow in the Department of International Studies at Rhodes College, and six other demographic experts analyze the links connecting population and environmental dynamics to conflict in a set of commentaries on “New Directions in Demographic Security.”

“The road to inaction is paved with research reports,” said Marya Khan, our Population Reference Bureau facilitator, opening today’s East Africa Population-Health-Environment (PHE) Network workshop on bridging the research-to-policy gap.

Rwandan Minister of Natural Resources Stanislas Kamanzi officially launched the meeting of the East Africa PHE Network this morning, stating that Rwanda’s highest-in-Africa population density of 365 people per square kilometer—which he argued leads to environmental degradation and poor human health in both rural and urban areas—compels an integrated approach to development. Kamanzi said that Rwanda’s National Environment Policy and national development plan, Vision 2020, both recognize population-health-environment (PHE) links, and he expressed Rwanda’s commitment to implementing the recommendations of the First Inter-ministerial Conference on Health and Environment in Africa, which was co-hosted by the World Health Programme and the UN Environment Programme in Gabon in August 2008.

From Conflict to Peacebuilding: The Role of Natural Resources and the Environment, based on the work of the UN Environment Programme’s Expert Advisory Group on Environment, Conflict and Peacebuilding, summarizes the links between the environment, conflict, and peacebuilding, and includes 14 case studies of how natural resources affect—or are affected by—conflict.

The authors of “On Population Growth Near Protected Areas” come to an opposite conclusion from Wittemyer et al., who found a pattern of higher population growth near protected areas in Africa and Latin America. “To understand the disagreement, we re-analyzed the protected areas in Wittemyer et al.’s paper. Their results are simply artifacts of mixing two incompatible datasets,” write the authors. “Protected areas may experience unusual population pressures near their edges; indeed, individual case studies provide examples. There is no evidence, however, of a general pattern of disproportionate population growth near protected areas.”

“The President and I agreed to a new initiative that will further cross-border cooperation on environmental protection and environmental security,” said Canadian Prime Minister Stephen Harper yesterday, announcing plans for a U.S.-Canada Clean Energy Dialogue.

Scientists at Purdue University have teamed up with Google Earth to create an interactive map of U.S. CO2 emissions.

Mark Weston, who writes for the Global Dashboard blog, posted an edited version of a recent talk he gave on West African demography and security.

“Human-animal conflicts have assumed alarming proportions in the region,” Asghar Inayati, a regional wildlife warden in Kashmir, recently told Inter Press Service (IPS) News. Since India and Pakistan gained independence in 1949, both sides have fought for control of the territory. Not only has the decades-long conflict claimed 100,000 lives (by some estimates), it has also displaced animals from their natural habitats, sparking violent encounters with local people and threatening many species’ survival.