Professor Terry Hartig, a leading environmental psychologist at Uppsala University, delivered a detailed talk on the importance of urban nature in supporting psychological, social, and physical health. Hartig began by emphasizing that his focus was on “nature in cities and cities in nature,” particularly how the experience of nature contributes to human health. He explained that these experiences are crucial for helping individuals recover from stress, mental fatigue, and the demands of everyday life.
At the heart of his presentation was the Pathway Domain Framework, a conceptual model that maps the relationships and processes between natural environments and human health outcomes. The framework originated from a 2004 review by the Health Council of the Netherlands, which explored intermediary mechanisms linking nature to health, such as opportunities for physical activity, social interaction, and psychological restoration. At that time, Hartig noted, research was fragmented, with little work addressing the full pathway from exposure to nature through these mechanisms to measurable health outcomes like mortality reduction.
In 2014, Hartig and colleagues formalized the framework in their influential paper published in the Annual Review of Public Health. This model traced the pathway from the natural environment through contact with nature as such—factors like frequency, duration, and the nature of experiences—to key pathways such as improved air quality, physical activity, social cohesion, and stress reduction. Hartig emphasized that these pathways often interact. For example, a visit to a park may simultaneously reduce stress for some individuals, improve air quality exposure, promote exercise, and encourage social bonding, illustrating the interconnectedness of these processes.
Further developments came in the 2017 study led by Markevych et al., which refined the framework by introducing the idea of adaptive relevance. Pathways were categorized into processes that nature have that can reduce harm (e.g., filtering pollutants), build capacities (e.g., promoting physical activity and social interactions), restore depleted resources (e.g., stress recovery), and acknowledge potential harm (e.g., allergens or other hazards). Hartig highlighted that these processes operate simultaneously at multiple levels: individual, small group, and community, demonstrating the complexity within the framework.
By 2021, the framework evolved further to include biodiversity’s role in health pathways. Biodiversity was recognized not just for its aesthetic and environmental importance but also for its influence on psychological restoration, ecosystem services, and adaptive processes.
Hartig underscored that researchers often work in disciplinary silos—air quality, social cohesion, or psychological restoration specialists rarely interact. The Pathway Domain Framework addresses this fragmentation and start dialogues by providing an integrative tool that bridges fields and highlights the interwoven nature of these pathways. Hartig stressed that contextual and individual factors, such as age, gender, socioeconomic status, and access to green spaces, shape how people benefit from nature.
In closing, Hartig emphasized that the framework is not just a theoretical tool; it has practical applications for urban planners, policymakers, and public health professionals. By protecting and enhancing natural spaces in urban settings, cities can foster healthier, more resilient communities while addressing pressing public health challenges. Nature, Hartig concluded, is not merely a passive element of urban design but an active and essential contributor to human well-being.