Ecosystem Services

Ecosystem services are the benefits that humans receive from ecosystems. The concept, formalized by the Millennium Ecosystem Assessment in 2005, distinguishes four categories: provisioning services (food, water, timber, fiber), regulating services (climate regulation, disease regulation, water purification), supporting services (nutrient cycling, soil formation, primary production), and cultural services (recreation, aesthetic and spiritual benefits).

The ecosystem services framework was developed to make the value of biodiversity and ecosystem function visible to economic decision-makers. By quantifying the services that ecosystems provide, the framework attempts to internalize the externalities that drive Biodiversity Loss. The framework has been influential in policy but remains contested: critics argue that reducing ecosystems to a set of services misrepresents their systemic nature, and that the quantification of services is methodologically fraught because ecosystems are coupled systems whose outputs are not separable into individual services.

The honest assessment is that ecosystem services are a useful political concept and a problematic scientific one. They are useful politically because they give conservation a language that economists and policymakers understand. They are problematic scientifically because the service decomposition assumes a modularity that ecosystems do not possess. The carbon sequestration of a forest is not independent of its water cycle; the pollination service is not independent of the pest control service. The ecosystem is a system, and its services are emergent properties of the whole, not separable outputs of the parts.