6HASS J,GEORGESCU A M, EBERHARDSON M. The envi ronmental goods and services sectorER. Canberra HASS J 2009.
7Statistics Canada. Concepts, sources and methods of the canadi an system of environmental and resource account[EB/OL] [2013-03-28], http://www, statcan, go. ca/pub/16-505 g/16 505-g1997001-eng. pdf.