A conservation or regeneration measure has succeeded if reliable evidence shows that it has met clearly defined ecological and societal objectives without causing unacceptable unintended impacts. Assessment must compare conditions before and after intervention, ideally against an untreated comparison site.
Level: HL: Subtopic 3.3 Conservation and regeneration. Assessing success is specifically covered by understanding 3.3.13.
The Reasoning
First, establish a baseline describing conditions before intervention. Then define measurable objectives, such as increasing the population of a threatened species, restoring habitat connectivity or improving local livelihoods.
Next, monitor suitable indicators over an appropriate timescale. Short-term increases may not demonstrate lasting recovery, so repeated measurements are needed. A comparison or control site helps determine whether change resulted from the measure rather than climate variation or another external factor.
| Area assessed | Possible indicators | Evidence of success |
|---|---|---|
| Ecological | Population size, breeding rate, species richness and evenness, habitat area, water quality | Target species recover, diversity rises and ecosystem processes become more resilient |
| Social | Local participation, access to resources, displacement, stakeholder attitudes | Benefits and decision-making are distributed equitably |
| Economic | Management cost, tourism income, employment, opportunity cost | Benefits remain sufficient to support long-term management |
| Management | Enforcement, funding, monitoring and adaptability | Threats are reduced and strategies respond effectively to new evidence |
Success depends on perspective. An ecocentric stakeholder may prioritize restored ecosystem processes, while a local community may emphasize livelihoods and access. Environmental justice must therefore be assessed: conservation that increases biodiversity by unfairly excluding Indigenous or local communities cannot be judged fully successful.
For example, Costa Rica's forest regeneration can be assessed through changes in forest cover and biodiversity alongside income from ecotourism and payments for ecosystem services. However, evaluators should also examine unequal access to payments and whether deforestation has shifted elsewhere.
Exam Technique
For an ESS evaluate question, give measurable evidence for both success and limitations, use a named example, consider contrasting perspectives, and finish with a supported judgement. Avoid the misconception that increasing one species automatically proves that the whole ecosystem has recovered.
