Any beneficial natural process arising from healthy ecosystems, such as purification of water and air, pollination of plants and decomposition of waste.

A measure of how much biologically productive land and water area an individual, population or activity requires to produce all the resources it consumes and to absorb the waste it generates using prevailing technology and resource management practices.

(informal) beneficial (or at least harmless) to the ecology of a region

A diagram that shows the relative amounts of energy or matter, or numbers of organisms within each trophic level in a food chain or food web.

plural of ecological pyramid