Ecological Risk Estimation -- See Ecological risk assessment Here are entered works on estimating and evaluating the actual or potential hazards that toxic substances pose to an ecosystem.
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Ecological Succession -- See Also the narrower term Plant succession
Ecologism -- See Green movement Here are entered works on the movement that embraces a political culture and lifestyle focused on environmental and other issues, such as ecological accountability, grass roots democracy, and pacifism, often based in a separate political party.