Comparing the relative abilities of tree species to cool the urban environment

Increasing urbanisation poses numerous challenges to human quality of life. Cities are particularly vulnerable to the urban heat-island effect, which will be amplified by climate change. Increasing tree cover may be one of the most cost-effective ways of moderating urban temperatures. Trees cool their surroundings by casting shade, reflecting solar radiation, transpiring, and intercepting rainfall that subsequently evaporates. However, the potential of trees to reduce the urban heat-island effect is underutilised. The aim of this study was to synthesise understanding of the relative abilities of different tree species to provide urban cooling in temperate regions of the world and thereby develop a pragmatic approach for choosing those trees that have greatest potential in that regard. Based on a literature review and semi-structured interviews with leading experts, we developed a series of scenarios to illustrate the impacts of a tree’s cooling mechanisms and tree species’ attributes on components of the surface-energy balance equation. This enabled us to select parameters and propose simple equations that can be used to compare the relative abilities of tree species in relation to each of the cooling mechanisms. The parameters selected were for: transpiration – crown diameter, Leaf Area Index (LAI), canopy aspect ratio, and stomatal conductance or growth rate; reflection – albedo, crown diameter and LAI; shading – canopy aspect ratio, crown diameter, LAI and tree height. The approach is intended for use by urban planners and managers who wish to make informed decisions about which tree species to select for planting to counter the urban heat-island effect.     

‘We can’t let them fail for one more day’: School reform urgency and the politics of reformer-community alliances

This article provides a critical examination of neoliberal urgency in education reform. While critics of neoliberal reform policies have argued that these reforms exclude low-income community participation almost entirely, I argue that in practice this exclusion is not as total or as overt as macro-analyses would suggest. These macro analyses do not explain the complicated alliances that reformers have with some community organizations, nor do they specifically and critically examine the role that urgency plays in determining the value of community voice in school reform decisions. On the ground, elite school reformers forge tenuous alliances with select low-income community groups, while disregarding and marginalizing others. In this article, I posit that ‘urgency,’ a cherished ideal and guiding principle of the neoliberal school reform movement, becomes the mechanism for elite school reformers to distinguish ‘good’ and valuable community allies from ‘backwards’ and ignorant community voices. A critical examination of school reformer narratives in particular reveals that the discourse and practice of school reform urgency both legitimizes and hides a more profound exclusion of low-income African American voices from the school reform process.     

Supporting the development of empathy: The role of theory of mind and fantasy orientation

Theory of mind (ToM) and empathy are separate, but related components of social understanding. However, research has not clearly defined the distinctions between them. Similarly, related constructs, such as fantasy orientation (FO), are associated with better ToM understanding; however, little is known about how FO may provide a context in which both ToM and affective empathy develop. Children between the ages of 3 and 5 (N = 82) completed a battery of ToM, empathy, and FO measures. Results demonstrated a developmental progression from ToM to affective empathy: 3‐year‐olds were likely to have neither, 4‐year‐olds were likely to have ToM only, and 5‐year‐olds were likely to have both. Additionally, results indicated that FO predicted affective empathy above and beyond ToM ability, suggesting that children whose play is high in fantasy are more practiced than their peers in sharing emotions. These findings are discussed in terms of how children's propensity toward fantasy play may contribute to their social development.     

The Measurement of Ethnic and Religious Divisions: Spatial,Temporal, and Categorical Dimensions with Evidence from Mindanao,the Philippines

Survey research on subjective wellbeing in The Netherlands started in the early 1970s. The time series happiness and life satisfaction that have emerged since then are unfortunately based on slightly different survey items of which one part uses verbal response scales and another part uses numerical response scales. The diversity of the survey items and a number of other measurement issues, such as the effects of changes in survey mode, hamper comparison over time and make it difficult to establish whether life became any better over the last forty years. These problems can be tackled using the recently developed Reference Distribution Method with which responses to equivalent but not identical survey questions can be pooled to obtain long, consistent time series. We applied the Reference Distribution method to pool time series of happiness and life satisfaction. We conclude that in the past 40 years the Dutch have become slightly happier and satisfied with their lives.     

Modeling Insurer‐Homeowner Interactions in Managing Natural Disaster Risk

The current system for managing natural disaster risk in the United States is problematic for both homeowners and insurers. Homeowners are often uninsured or underinsured against natural disaster losses, and typically do not invest in retrofits that can reduce losses. Insurers often do not want to insure against these losses, which are some of their biggest exposures and can cause an undesirably high chance of insolvency. There is a need to design an improved system that acknowledges the different perspectives of the stakeholders. In this article, we introduce a new modeling framework to help understand and manage the insurer's role in catastrophe risk management. The framework includes a new game‐theoretic optimization model of insurer decisions that interacts with a utility‐based homeowner decision model and is integrated with a regional catastrophe loss estimation model. Reinsurer and government roles are represented as bounds on the insurer‐insured interactions. We demonstrate the model for a full‐scale case study for hurricane risk to residential buildings in eastern North Carolina; present the results from the perspectives of all stakeholders—primary insurers, homeowners (insured and uninsured), and reinsurers; and examine the effect of key parameters on the results.     

From state introversion to state extension in Mexico: Modes of emigrant incorporation, 1900-1997

Theory and Society -     

Mitigating an elephantine epidemic: gendered space for HIV/AIDS outreach through Namibian conservancies

As the reach of HIV/AIDS continues to devastate communities and create potential pressures on natural resources, conservation organizations have increasingly become involved in education and outreach to address the disease. This paper’s purpose is to investigate how increasing HIV infection rates and AIDS deaths relate to community-based conservation and livelihood strategies in the Caprivi Region of northeastern Namibia, and demonstrate that conservation organizations can play a unique role in combating the disease. As the epidemic is more widespread in the Caprivi than in any other region of the country, local organizations such as Integrated Rural Development and Nature Conservation (IRDNC) are responding to the disease by integrating it into conservation work. IRDNC’s efforts reflect a particular focus on gender, including changes in the way that HIV/AIDS is discussed in local communities, strategies to promote access to testing and care, and bringing to light the experiences of individuals and families struggling with HIV/AIDS. This approach shows that there are benefits to be gained from approaching HIV/AIDS mitigation through familiar, existing structures such as those of community conservancies in Namibia—especially the ability to circumvent heavy local stigma. Using data collected through participant observation and participatory discussions, this paper demonstrates that conservation programs can positively affect people with HIV/AIDS, highlighting the importance of mainstreaming outreach efforts that address the particular localized manifestations of the disease in the context of natural resource management.     

THE NEED TO KNOW: Cultured Ignorance and Jewish Resistance in the Ghettos of Warsaw, Vilna, and Łódź

This article explores the role of knowledge in collective action with an examination of resistance efforts in the Jewish ghettos of Nazi-occupied Warsaw, Vilna, and Łódź during World War II. Because sustained collective resistance took place in Warsaw but not in the other two ghettos, a comparison of these cases is useful toward an understanding of the factors that facilitate collective action. Drawing on Schwartz's concept of "structured ignorance" and Snow and Benford's discussion of "empirical credibility," I show that resistance occurred when and where Jews were able to gain information about the Nazi regime's genocidal plans and believed that information to be credible. The cases therefore suggest that in addition to being "structured," ignorance may also be "cultured," in the sense that there may be limits to what individuals will interpret as possible and true. Warsaw Jews fought back in part because they were able to overcome both structured and cultured ignorance, while Jews in the other ghettos were not able to overcome these barriers to collective action. Suggestions for further research are outlined.     

Differentiation of the Self and Posttraumatic Symptomatology Among ex-POWs and Their Wives

War captivity is a highly traumatic experience which sometimes has deleterious effects on both ex-POWs and their wives. This study examined the relationships between posttraumatic stress disorder (PTSD) symptoms and differentiation among male ex-prisoners of war (ex-POWs; n  = 103), their wives ( n  = 82), and comparable controls. Results show that ex-POWs and their wives endorsed more PTSD symptoms than controls. Ex-POWs endorsed more cut-off and fusion than controls, while their wives endorsed only more fusion than control wives. Finally, the relationship between differentiation and PTSD was found to be stronger among ex-POW couples than among control couples. The unique characteristics of war captivity and the relationships between avoidance symptoms and cut-off were suggested as possible explanations .