Everything is connected to everything else. A change in one of the parts of a system will can change the other parts and the whole. No part of an ecosystem can be removed without potentially altering the dynamics of the system. If too many changes occur, an ecosystem can collapses. Humans and their activities are not exempted from this these ruleprinciples.
Sustainability is an ambiguous concept.
One view of sustainability emphasizes that Ssustainable practices are those that maintain or support healthy ecological systems. Characteristics of healthy ecosystems are diversity, interdependence and adaptability. Other definitions of sustainability emphasize economic and sociological resilience. Courses must include balanced and rigorous content from each of the two different perspectives mentioned below. Environmental issues will continue to be a critical concern for students in the coming century.