Sustaining Life: Human Health–Planetary Health Linkages

Human activities have profoundly changed the planet we call home. Climate change, the loss of plant and animal species, pollution, shifting land use, and disruptions to essential cycles like water and nutrients are just a few of the ways people have altered Earth’s systems.

And those changes don’t just affect the environment. They have serious consequences for human health, too, especially for the most vulnerable communities.

Planetary Health is a way of thinking that treats the well-being of people and the well-being of the planet as deeply connected. You can’t solve one without addressing the other.

This chapter introduces the Planetary Health framework through four real-world examples: climate change, chemical contamination, land use changes, and biodiversity loss. Each one shows how environmental degradation and human health are linked.

The chapter closes by exploring new ways of thinking and fresh ethical questions raised by the current crisis. As the planet’s health declines, how should we rethink our values, our priorities, and our responsibilities to each other and to future generations?