This category deals with environmental sustainability on a global geographic scale
Some starting points for the topic of environmental sustainability in general:

ACTIVITIES ARE SUSTAINABLE WHEN THEY:

1. Use materials in continuous cycles.
2. Use continuously reliable sources of energy.
3. Come mainly from the non-destructive use of materials (ie. creativity, communication, coordination, appreciation, and spiritual and intellectual development.)

ACTIVITIES ARE NOT SUSTAINABLE WHEN THEY:

1. Require continual inputs of non-renewable resources.
2. Use renewable resources faster than their rate of renewal.
3. Cause cumulative degradation of the environment.
4. Require resources in quantities that undermine other people's well-being.
5. Lead to the extinction of other life forms.