ASU center releases 10-year report on climate, urbanization, water in Phoenix

December 10, 2013

In anticipation of its 10-year anniversary, Arizona State University’s Decision Center for a Desert City (DCDC) has released a major new report, “Advancing Science in Support of Water Policy and Urban Climate Change Adaptation at Arizona State University’s Decision Center for a Desert City: A Synthesis of Interdisciplinary Research on Climate, Water, and Decision-Making Under Uncertainty.”

The report summarizes the center’s major achievements in research, education and community and institutional outreach since its founding in 2004. Download Full Image

Funded by the National Science Foundation and organized under ASU’s Global Institute of Sustainability, the center is focused on water sustainability, urban climate adaptation and decision-making under uncertainty. The center pursues research – in close collaboration with stakeholders – to create a more sustainable future.

Research and modeling efforts analyze interacting factors, such as population growth and economic development, climate change and variability, water supplies and demands, and governance to inform water management and other environmental decisions among diverse stakeholders.

This report was authored by co-investigators Kelli Larson, Dave White, Pat Gober, Craig Kirkwood, V. Kerry Smith, Margaret Nelson and Charles Redman, along with research professional Sally Wittlinger.

“This synthesis of DCDC findings was essential for us to back up and say, ‘What have we learned from it all, and where are we going next?’” says Kelli Larson, the report’s lead author and a co-principal investigator at the center.

Since its founding, DCDC participants have published over 340 peer-reviewed journal articles and book chapters, and supported 69 graduate students who have authored 18 doctoral dissertations and 17 master’s theses. In addition, more than 70 undergraduate students have been involved in the center's research through the Internship for Science-Practice Integration, the Community of Undergraduate Scholars program and other research assistantships.

“The most challenging and complex sustainability problems facing society today – like climate change – require a new approach to science,” says Dave White, center principal investigator and co-director. “We must combine interdisciplinary science within the university with meaningful stakeholder engagement. This ‘transdisciplinary’ approach is reflected in the report, which synthesizes DCDC’s most important findings across a diverse range of disciplines and identifies the most pressing new issues.”

The report recaps the history and role of the center within scientific and policy dialogue, and then plunges into the research results that have been produced over the years. A major theme is the challenge for cities to provide and maintain secure and reliable water supplies despite an uncertain future that will likely include warming temperatures, reduced precipitation and more extreme weather events, such as droughts, fires and floods.

“Key findings across DCDC research have revealed uneven spatial and social vulnerabilities to water scarcity and other risks, as well as inevitable tradeoffs and uncertainties in decision-making,” Larson says. “To cope with the complexities of environmental change, collaborations and social learning across different actors – such as scientists and policymakers, water managers and land-use planners – is essential for urban sustainability.”

The report covers topics ranging from climate models used to predict how climate change affects water supplies and demands to analyses on risk perceptions and policy attitudes regarding water resource sustainability. Center participants have also contributed substantially to the ASU portfolio of research into climate dynamics, including the potential for climate change scenarios to affect regional water resources, in addition to localized urban heat island effects, and especially their impact on water resources. This work has involved analyzing how urban land-use and land-cover patterns interact with climatic factors to affect water demands.

One of the signature products of the center, WaterSim, is described in detail in the report. WaterSim is a systems dynamics model used by researchers, educators and decision-makers to explore scenarios of climate change, population growth and how policy choices could alter water supply and demand in central Arizona.

Since its inception, DCDC has served as a type of “boundary organization” designed to bring together academic researchers with diverse stakeholders to ensure that science is not only credible, but also relevant for decision-making. In this role, the center has engaged with its partners through educational activities, including joint research projects and collaborative workshops. Many of these activities are highlighted throughout the report.

For more information on the Decision Center for a Desert City and its multi-disciplinary research and activities, visit

Researchers find that cultural evolution is similar for humans, chimpanzees

December 10, 2013

Humans and chimpanzees appear to share the ability to sequentially adopt cultural traits, thereby increasing cultural complexity in a cumulative fashion.

The research behind this discovery by Arizona State University evolutionary anthropologist Jason Kamilar and evolutionary psychologist Quentin Atkinson of the University of Auckland appears this week in the Proceedings of the National Academy of Sciences. group of chimpanzees Download Full Image

The findings address a subject that generates much discussion, yet is difficult to investigate.

“The evolution of human culture is well-documented in the paleontological record, but similar data are absent for other primates,” says Kamilar, adjunct faculty in the School of Human Evolution and Social Change in the College of Liberal Arts and Sciences.

Kamilar and Atkinson examined the possibility that sequential cultural evolution is shared between humans and great apes in the form of “cultural nestedness,” or the tendency of populations with small cultural repertoires to comprise a proper subset of traits of more complex repertoires.

Using statistical tools from community ecology, they quantified the degree of nestedness in four datasets representing the presence or absence of numerous cultural traits from indigenous human populations in California and New Guinea. Next, they compared the human patterns to those found in chimpanzees and orangutans.

They discovered that cultural repertoires exhibited a significant degree of nestedness in humans and chimpanzees, but not in orangutans.

Their findings suggest that the necessary traits for sequential cultural evolution arose in the last common ancestor of humans and chimpanzees.

“Alternatively, this feature of culture may have originated earlier in time but was lost in modern orangutans because of extensive population level extinctions throughout southeast Asia during the last several thousand years,” Kamilar explains. “These extinctions may have been associated with a substantial loss of cultural diversity, resulting in modern orangutan cultural variation presenting in a random pattern across study sites.”

Rebecca Howe

Communications Specialist, School of Human Evolution and Social Change