What is meant by Eco-efficiency ?

The term eco-efficiency was coined by the World Business Council for Sustainable Development (WBCSD) in its 1992 publication "Changing Course". It is based on the concept of creating more goods and services while using fewer resources and creating less waste and pollution. Some changes it has made
Interface, one of the world’s largest producers of commercial floor covering, saved over $200 million from 1996 to 2002 through its sustainability efforts.
HP in California reduced its waste by 95% and saved $870,564 in 1998.
STMicroelectronics, a Swiss-based technology manufacturer, saved £38 million in energy and $8 million in water costs, with a total saving over a decade predicted at $900 million.
Dupont reduced energy use by one-third at one facility saving over $17 million per year on power while reducing greenhouse gas pollution per pound of product by half. In 2000, it saved almost $400 million due to resource and productivity improvement.
In five years, SC Johnson increased production by 50% while waste emissions were cut by half, resulting in annual cost savings of more than $125 million.
United Technologies Corporation’s sites eliminated almost 40,000 gallons per year of waste water and saved over US$50,000 per year with a fundamental change in the way it manages its test cells, underground storage tanks and waste streams.