Define the precautionary principle in cross-border environmental cooperation and provide a representative scenario.

• A. Act to prevent or minimize potentially serious or irreversible harm when scientific certainty is insufficient; scenario: adopting stricter emissions controls near a shared watershed while assessing full impacts.
• B. Act only after full scientific certainty is established.
• C. Allow activities that might cause harm if economic costs are high.
• D. Avoid any action until there is clear evidence of harm.

Answer: (A)

The precautionary principle in cross-border environmental cooperation means taking preventive action to avoid potentially serious or irreversible harm even when scientific certainty isn’t complete. When resources are shared across borders, such as a watershed that affects multiple countries, there’s a responsibility to protect the resource and downstream communities now rather than wait for perfect proof of harm. Adopting stricter emissions controls near a shared watershed while continuing to study and assess all impacts is a clear example: it reduces the risk of damage to the shared ecosystem and to neighboring states, and it can be adjusted as new information becomes available. This proactive stance contrasts with approaches that wait for full certainty or proven harm before acting, which can allow avoidable damage to occur.