"Environmental goods and services (EGS) as a subset of goods and services was singled out for attention in the negotiating mandate adopted at the Fourth Ministerial Conference of the World Trade Organization (WTO) in November 2001. Increasing access to and use of EGS can yield a number of benefits including reducing air and water-pollution, improving energy and resource-efficiency and facilitating solid- waste disposal to name a few of the benefits." (Quoted from site)