Essay

Policy Design for a Lake Ecosystem at Risk

Imagine you are a policy advisor for a region whose primary industry, fishing, depends on a large lake ecosystem. Scientific models show that the lake has two stable states: a 'clear water' state with abundant fish and a 'murky water' state dominated by algae, with very few fish. The transition from clear to murky is a rapid, hard-to-reverse shift that occurs if agricultural runoff (a pollutant) exceeds a specific critical threshold. Propose and justify a policy intervention designed to manage this risk. In your answer, explain how your policy specifically addresses the nature of this critical threshold phenomenon.

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Updated 2025-09-17

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