Widely used techniques to determine the impact of human activities on an environmental system by assigning an economic value to an ecosystem or its ecosystem services
US Department of Commerce, National Oceanic and Atmospheric Administration, Glossary - NOAA's State of the Coast (SOTC), Washington, DC, USA 2013. http://stateofthecoast.noaa.gov/glossary.html, (CoaStormEmr - Amer) {881}