Planetary Boundaries
Life On LandExplore the concept of planetary boundaries, a scientific framework that identifies the environmental limits within which humanity can safely operate.
In this challenge, you will explore the concept of planetary boundaries, a scientific framework that identifies the environmental limits within which humanity can safely operate. You will learn how Earth’s systems function, why certain boundaries have been crossed, and what this means for the future of life on Earth.
Learning Goals
Planetary Boundaries Framework
What Are Planetary Boundaries?
The Holocene and the Anthropocene
Earth as a Complex System
Planetary Boundaries Framework Key Takeaways
The Nine Planetary Boundaries
The Nine Boundaries Explained
Why Some Boundaries Matter More Than Others
Key Takeaways from the Nine Planetary Boundaries
Climate, Land, and Oceans
In this section, you will explore three planetary boundaries that directly shape the physical environment: climate change, land-system change, and ocean acidification. You will learn how each of these systems works, how they are being affected by human activity, and what is at risk when these boundaries are crossed.
Climate Change
Land-System Change
Ocean Acidification
Climate, Land, and Oceans Key Takeaways
Life-Sustaining Boundaries
In this section, you will examine three planetary boundaries that directly support life on Earth: freshwater use, biogeochemical flows (nitrogen and phosphorus cycles), and biosphere integrity. These systems regulate the availability of water, the fertility of ecosystems, and the balance of life on the planet.
Freshwater Use
Biogeochemical Flows
Biosphere Integrity
Life-Sustaining Boundaries Key Takeaways
Atmospheric and Synthetic Boundaries
Atmospheric Aerosol Loading
Stratospheric Ozone Depletion
Novel Entiries
Atmospheric and Synthetic Boundaries Key Takeaways
Where We Are and Where We're Goin
In this section, you will examine the status of the planetary boundaries and reflect on what it means to live in a world where several have already been crossed. You’ll explore the consequences of operating outside Earth’s safe zone, as well as the opportunities for change.
