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Background: While services tailored for gay, bisexual, and other men who have sex with men (gbMSM) may provide support for this vulnerable population, planning access to these services can be difficult due to the unknown spatial distribution of gbMSM outside of gay-centered neighborhoods. This is particularly true since the emergence of geosocial networking apps, which have become a widely used venue for meeting sexual partners. Objective: The goal of our research was to estimate the spatial density of app users across Metro Vancouver and identify the independent and adjusted neighborhood-level factors that predict app user density. Methods: This pilot study used a popular geosocial networking app to estimate the spatial density of app users across rural and urban Metro Vancouver. Multiple Poisson regression models were then constructed to model the relationship between app user density and areal population-weighted neighbourhood-level factors from the 2016 Canadian Census and National Household Survey. Results: A total of 2021 app user profiles were counted within 1 mile of 263 sampling locations. In a multivariate model controlling for time of day, app user density was associated with several dissemination area–level characteristics, including population density (per 100; incidence rate ratio [IRR] 1.03, 95% CI 1.02-1.04), average household size (IRR 0.26, 95% CI 0.11-0.62), average age of males (IRR 0.93, 95% CI 0.88-0.98), median income of males (IRR 0.96, 95% CI 0.92-0.99), proportion of males who were not married (IRR 1.08, 95% CI 1.02-1.13), proportion of males with a postsecondary education (IRR 1.06, 95% CI 1.03-1.10), proportion of males who are immigrants (IRR 1.04, 95% CI 1.004-1.07), and proportion of males living below the low-income cutoff level (IRR 0.93, 95% CI 0.89-0.98). Conclusions: This pilot study demonstrates how the combination of geosocial networking apps and administrative datasets might help care providers, planners, and community leaders target online and offline interventions for gbMSM who use apps.

A crucial contemporary public health issue is the construction and contestation of the relevance of the natural world to human health. Taking a critical approach, this thesis examines how the natural environment as a health determinant is positioned in relation to the ‘social’ within social epidemiological studies of health, illness and disease. Using conceptual and empirical forms of enquiry, this study shows how current constructions of natural environmental health drivers contour public health practice in the UK and that by challenging the limits of existing structures, innovative responses emerge, which can generate new frameworks for health policy and practice.\ud \ud Having identified a lacuna in research on the ‘natural’ environment in medical sociology, this inductive qualitative research project brings into conversation the findings from extensive desk and field research. Specially, a study of the elaboration of environmental health discourses within the UK public health policy arena and disciplinary wide discourse analyses of key academic journals are read together to describe the discursive practices shaping environmental public health work in the UK. Linking theory to practice, data from in-depth interviews with sixty health professionals working on health and the environment in the UK and internationally are used to investigate how public health practitioners produce the environment within their work remits.\ud \ud The research breaks ground for further social scientific studies of health and the environment and in particular substantiates the call for an extended notion of the ‘environment’ using ecological principles. Methodologically, the interdisciplinary reach of this research draws attention to the tensions that arise when working across the medical, natural and social sciences. Practical and philosophical questions about the challenge of expanding the sociological imagination in the contemporary moment are also considered. Empirically, to medical sociology the ‘EcoBioPsychoSocial’ framework is offered as a tool for studying health at the nexus between the ‘social’ and the ‘natural environment.’ Finally, the ways informal public health institutions are serving as ‘invisible’ forces impeding the uptake of prevention oriented environmental health policies are findings offered to the health policy arena.

Despite widespread calls to action from the scientific community and beyond, a concerning climate action gap exists. This paper aims to enhance our understanding of the role of connectedness to nature in promoting individual-level climate action in a unique setting where climate research and action are lacking: Canada���s Provincial North. To begin to understand possible pathways, we also examined whether climate worry and talking about climate change with family and friends mediate the relationship between connectedness to nature and climate action. We used data collected via postal surveys in two Provincial North communities, Thunder Bay (Ontario), and Prince George (British Columbia) (n = 628). Results show that connectedness to nature has a direct positive association with individual-level climate action, controlling for gender and education. Results of parallel mediation analyses further show that connectedness to nature is indirectly associated with individual-level climate action, mediated by both climate worry and talking about climate change with family and friends. Finally, results suggest that climate worry and talking about climate change with family and friends serially mediate the relationship between connectedness to nature and with individual-level climate action. These findings are relevant for climate change engagement and action, especially across Canada���s Provincial North, but also in similar settings characterized by marginalization, heightened vulnerability to climate change, urban islands within vast rural and remote landscapes, and economies and social identities tied to resource extraction. Drawing on these findings, we argue that cultivating stronger connections with nature in the places where people live, learn, work, and play is an important and currently underutilized leverage point for promoting individual-level climate action. This study therefore adds to the current and increasingly relevant calls for (re-)connecting with nature that have been made by others across a range of disciplinary and sectoral divides.