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# Sustaining planetary health through systems thinking: Public health's critical role

## Details

**Authors** Iyer et al.

**Year** 2021

**Publisher** The Journal of Climate Change and Health (Elsevier)

**Kind of work** article

**Discipline** Public Health

**Secondary disciplines** Environment & Sustainability

**Reading level** intermediate

**Kind of engagement** scholarly

[Read it](https://www.sciencedirect.com/science/article/pii/S2352827321001191) 
10.1016/j.ssmph.2021.100844

## In authors' words

### Abstract

Understanding and responding to adverse human health impacts of global environmental change will be a major priority of 21st century public health professionals. The emerging field of planetary health aims to face this challenge by studying and promoting policies that protect the health of humans and of the Earth’s natural systems that support them. Public health, drawing on its experience of guiding policies to improve population health, has contributed to planetary health’s development. Yet, few public health practitioners are familiar with planetary health’s systems-oriented approaches for understanding relationships between economic development, environmental degradation, and human health. In this narrative review, we present key planetary health concepts and show how systems thinking has guided its development. We discuss historical approaches to studying impacts of economic development on human health and the environment. We then review novel conceptual frameworks adopted by planetary health scientists to study and forecast impacts of policies that influence human health and Earth’s natural systems at varying spatiotemporal scales. We conclude by presenting examples of how applying the “Doughnut” model (an economic framework where the needs of people are met without overshooting the world’s ecological limits) could guide policies for promoting health co-benefits to humans and natural systems.

### What they set out to do (purpose)

This narrative review examined how systems thinking can help public health understand and respond to planetary health problems, especially the interconnected effects of economic development, environmental degradation, and human health. The authors reviewed systems-oriented frameworks and policy examples involving food systems, urbanization, environmental change, and the health of both people and natural systems.

### What they found (results)

The authors argue that systems thinking is essential for understanding complex causal pathways, feedback, multilevel systems, and unintended consequences. They show that considering systems and multiple perspectives can reveal policy effects that reductionist approaches may miss and can help identify policies that produce co-benefits for human health and natural systems.

## Commentary

### In short

Adopts Cabrera & Cabrera's DSRP structure (distinctions, part-whole systems, causal relationships, perspectives) as the organizing vocabulary for how public health should reason about planetary health. The paper explicitly defines systems thinking through the four DSRP patterns and applies that framework to public-health and planetary-health problems. It also reviews empirical and modeling evidence showing benefits from systems-oriented policies.

### In more detail

This paper is a narrative review rather than a controlled experiment. The authors trace how systems thinking has shaped the emerging field of planetary health and compare traditional, more reductionist approaches to public health with frameworks that explicitly account for interconnected human, environmental, economic, and social systems. They review models including planetary boundaries, social-ecological systems, panarchy, and Raworth’s Doughnut framework, and use examples involving global food production and urbanization to show how policies can generate effects across multiple levels and timescales. The review also examines research and modeling on dietary change, transportation, land use, pollution, climate change, and health to illustrate how systems-oriented analysis can identify feedback, unintended consequences, trade-offs, and potential co-benefits for both human and natural systems.

### Response

A narrative review in public health that defines systems thinking through the four patterns and uses them as the organizing vocabulary for reasoning about planetary health. The four are adopted as the working definition rather than cited in passing.

**Patterns it shows** D, S, R, P

Shows it makes a difference

**Added** 2026-08-14

**How to cite this** Iyer et al. (2021). Sustaining planetary health through systems thinking: Public health's critical role. The Journal of Climate Change and Health (Elsevier).