In a special “Rivers in Crisis” issue of Nature, the lead article, “Global Threats to Human Water Security and River Biodiversity,” presents damning evidence that manipulation of river systems — through the construction of canals, levees, hydroelectric projects, and other infrastructure — has caused serious and lasting biological damage to watersheds throughout both the developing and developed worlds. The authors (all 11 of them!) report that key rivers have become shadows of their former selves in terms of the amount of aquatic life they can support. Without drastically improved stewardship of waterways, “we are pushing these river systems toward catastrophe,” warns Peter McIntyre, an article co-author.

From Hydrology and Earth System Sciences Discussions, “Uncertainty in Water Resources Availability in the Okavango River Basin as a Result of Climate Change,” by D.A. Hughes, D.G. Kingston, and M.C. Todd, explores the effects of a two degrees Celsius global warming scenario on the Okavango River Basin, a “major natural resource for human water supply” shared by Angola, Botswana, and Namibia. The authors conclude that “there is a relatively high probability of large changes to the extent and duration of inundation within the delta wetland system during the 21st century,” and recommend multi-annual to decadal ecological assessments of assumed low rainfall and river flow to guide integrated river basin water management plans.

“Climate Change and China’s Agricultural Sector: An Overview of Impacts, Adaptation and Mitigation” from the International Centre for Trade and Sustainable Development (ICTSD) explores mitigation and adaptation strategies to avoid the worst effects of climate change in China’s farming sector. The authors, Jinxia Wang, Jikun Huang and Scott Rozelle, point out that, although often overlooked in favor of the industrial sector, a disproportionate amount (greater than 15 percent) of China’s greenhouse gas emissions come from agriculture. Challenges include over-fertilization, high methane levels, water pollution, and water scarcity. Wang, Huan, and Rozelle predict that trade “can and should be used to help China mitigate the impacts of climate change” and programs promoting better calibration of fertilizer dosages and “conservation tilling” practices will help farmers reduce emissions.

“The role of intergenerational transfers, land, and education in fertility transition in rural Kenya: the case of Nyeri district” in Population & Environment by Karina M. Shreffler and F. Nii-Amoo Dodoo, explores the reasons for a dramatic and unexpected decline in fertility in rural Kenya. In one province, total fertility rate (TFR) declined from 8.4 to 3.7, from 1978 to 1998. The study found numerous contributing factors for this decline, which occurred more quickly and earlier than demographers expected, but land productivity seemed to be the primary motivator. A growing population and the tradition of dividing family land among sons made continuing to have large families unrealistic for these Kenyan families. “Family planning is, therefore, not the primary causal explanation for limiting the number of children, but rather serves to help families attain their ideal family sizes,” the authors conclude.

From the ocean-themed June issue of Science comes “Sea-Level Rise and Its Impact on Coastal Zones“, by Robert J. Nicholls and Anny Cazenave. While sea-level rise will “almost certainly accelerate through the 21st century and beyond because of global warming,” Nicholls and Cazenave state that its magnitude remains uncertain. Small islands as well as the coasts of Africa, India, Southeast Asia, and China are identified as vulnerable areas because of their “dense populations, low elevations, appreciable rates of subsidence, and/or inadequate adaptive capacity.” Nicholls and Cazenave call for more research and analysis into adaptation, which “remains a major uncertainty.”

Are Women the Key to Sustainable Development?, by Candice Stevens and appearing in Boston University’s Sustainable Development Insights series, asks whether gender-conscious development strategies are the missing link in the three pillars–social, economic, and environmental–of sustainable development. She points out that “An increasing number of studies indicate that gender inequalities are extracting high economic costs and leading to social inequities and environmental degradation around the world.” In the policy world gender-conscious initiatives are often more effective as well. “United Nations and World Bank studies show that focusing on women in development assistance and poverty reduction strategies leads to faster economic growth than ‘gender neutral’ approaches.” Stevens finds that achieving greater gender parity may be the key to better governance, increased growth, and a safer environment.

Desired Number of Children: 2000-2008, a report prepared by Charles Westoff of Princeton University for USAID, reviews family size preferences in 60 countries. Taking its data from a series of Demographic and Health Surveys (DHS), the report found that “the number of children desired is declining in most of the developing world.” The noted exception is western and middle sub-Saharan Africa where, in some countries, 6.0 children remains the desired number. The report found that desire for smaller family sizes, rather than a reduction of unwanted births, was the primary factor behind the declining Total Fertility Rates (TFR) exhibited in most of the countries studied. It noted that men’s preference is close to, but larger than, that of women, and that preference sizes were declining even among women without formal education. The report concluded that preferred family size broadly depended upon “child mortality, Muslim affiliation, women’s education and empowerment, and exposure to the mass media.”

The Economist published this week For Want of a Drink, its special report on water. The report, a compilation of 11 articles, is a mix of surveys of global management strategies, health impacts, and economic considerations on the one hand, and deeper looks into specific practices in Singapore, India, and China on the other. Most interesting for New Security Beat readers is the article “To the Last Drop: How to Avoid Water Wars.” The article states there have been “no true water wars,” but goes on to question whether the pressures of climate change and population growth could generate different outcomes in the future. While the challenges laid out are manifold, the article concludes that potential for cooperation is equally present. “The secret is to look for benefits and then try to share them. If that is done, water can bring competitors together.”