The tragedy of the commons explains catastrophic climate change because individual countries and businesses benefit from emitting greenhouse gases, while the environmental costs are shared globally. Without effective international cooperation, rational short-term decisions can collectively destabilize the climate system.
The Reasoning and Mechanism
In IB ESS Subtopic 6.3: Climate change: mitigation and adaptation, this relationship is HL only. A common-pool resource is difficult to exclude people from using, but its capacity is limited. The atmosphere functions as a global commons because no single country owns it, yet its capacity to absorb greenhouse gases without dangerous warming is finite.
The mechanism operates step by step:
- Burning fossil fuels provides private benefits, including energy, employment and economic growth.
- The resulting emissions enhance the greenhouse effect, but their costs are distributed across all societies and ecosystems.
- Each emitter has an incentive to let others reduce emissions while continuing its own emissions. This is the free-rider problem.
- Combined emissions may drive positive feedback loops, tipping points and potentially catastrophic climate change.
| Scale | Individual incentive | Collective consequence |
|---|---|---|
| Business | Avoid costly decarbonization | Higher global greenhouse gas emissions |
| Country | Protect short-term growth and energy security | Failure to achieve sufficient global mitigation |
| Global system | No single authority fully controls atmospheric use | Risk of crossing climate tipping points |
The Paris Agreement illustrates international cooperation intended to manage this commons through national emissions commitments. However, enforcement limitations and conflicting technocentric, anthropocentric and ecocentric perspectives can weaken collective action.