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Shade plays an important role in designing pedestrian-friendly outdoor spaces in hot desert cities. This study investigates the impact of photovoltaic canopy shade and tree shade on thermal comfort through meteorological observations and field surveys at a pedestrian mall on Arizona State University’s Tempe campus. During the course of 1 year, on selected clear calm days representative of each season, we conducted hourly meteorological transects from 7:00 a.m. to 6:00 p.m. and surveyed 1284 people about their thermal perception, comfort, and preferences. Shade lowered thermal sensation votes by approximately 1 point on a semantic differential 9-point scale, increasing thermal comfort in all seasons except winter. Shade type (tree or solar canopy) did not significantly impact perceived comfort, suggesting that artificial and natural shades are equally efficient in hot dry climates. Globe temperature explained 51 % of the variance in thermal sensation votes and was the only statistically significant meteorological predictor. Important non-meteorological factors included adaptation, thermal comfort vote, thermal preference, gender, season, and time of day. A regression of subjective thermal sensation on physiological equivalent temperature yielded a neutral temperature of 28.6 °C. The acceptable comfort range was 19.1 °C–38.1 °C with a preferred temperature of 20.8 °C. Respondents exposed to above neutral temperature felt more comfortable if they had been in air-conditioning 5 min prior to the survey, indicating a lagged response to outdoor conditions. Our study highlights the importance of active solar access management in hot urban areas to reduce thermal stress.Electronic supplementary materialThe online version of this article (doi:10.1007/s00484-016-1172-5) contains supplementary material, which is available to authorized users.

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Defining public interest technology This special issue is dedicated to the theme of public interest technology (PIT) [1]. PIT acknowledges that technological potential can be harnessed to satisfy the needs of civil society. In other words, technology can be seen as a public good that can benefit all, through an open democratic system of governance, with open data initiatives, open technologies, and open systems/ ecosystems designed for the collective good, as defined by respective communities that will be utilizing them. Just like in the established field of public interest law (PIL) [2], [3] and public interest journalism (PIJ) [4], we can consider potential fields around the idea of PIT [5], [6], such as public interest co-design (PITco), even public interest engagement (PITengage) or public interest consulting (PIC). For decades, public interest engineers (PIEs) have volunteered their time to collaborate in meaningful participative engagements. These engineers have self-organized some impressive collectives including Engineers Without Borders, ASCE Disaster Assistance Volunteer Program, Appropriate Infrastructure Development Group, Architecture for Humanity, Bridges to Prosperity, Bridging the Gap Africa, Engineers for a Sustainable World, GISCorps, Habitat for Humanity, National Engineering Projects in Community Service, just to name a few. These collectives and initiatives call attention to the primary role of a PIT practitioner.

In the United States of America, 2.2 million people are incarcerated in public and private facilities and over 700,000 are released yearly back to their home communities. Almost half are rearrested within a year. These problems have been excluded from mainstream sustainability narratives, despite their serious implications for sustainability. This paper addresses how the criminal justice, prison-industrial complex and foster care systems negatively impact these communities and families. To comprehend the system links, a sustainability lens is used to examine and address interlinking system impacts obstructing achievement of sustainability and the necessary community characteristics for building sustainable communities. Communities characterized by environmental degradation, economic despair and social dysfunction are trapped in unsustainability. Therefore, a system-of-communities framework is proposed which examines the circumstances that bring about prison cycling which devastates family and community cohesion and social networking, also negatively affecting the ability of other communities to become truly sustainable. We contend that a fully integrated social, economic and environmental approach to a major, complex, persistent problem as it relates to poor, marginalized communities faced with mass incarceration and recidivism can begin creating sustainable conditions. Further, we articulate ways sustainability narratives could be changed to engage with core challenges impeding these communities.