Uncertainty

An expression of the degree to which a future condition (e.g., of an ecosystem) is unknown.

Uncertainty can result from lack of information or from disagreement about what is known or even knowable. It may have many types of sources, from quantifiable errors in the data to ambiguously defined terminology or uncertain projections of human behavior. Uncertainty can therefore be represented by quantitative measures (e.g., a range of values calculated by various models) or by qualitative statements (e.g., reflecting the judgment of a team of experts).

Source: Millennium Ecosystem Assessment  Glossary

Español: Incertidumbre
Français: Incertitude

Ecosystem Change

Climate Change

Ozone

Particulate Matter

Nitrogen Dioxide