Regarding the human population, end-targets for an optimum population include ecological sustainability, economic output and philosophical or ethical ends-in-themselves.

After several improvements, it now ranks 84th in the world for ecological sustainability.

Such efforts include advocacy on ecological sustainability, corporate responsibility, social justice and similar progressive issues.

A primary focus of the school's construction was ecological sustainability.

Actual outcomes in terms of efficiency and ecological sustainability are varied based on design and implementation of the program.