1 Sustainability

2 Define Sustainability The term sustainability means that the system can meet the needs not only of our present human population, but also those of the future.

3 Earth as a Sustainable System The modern paradigm views Earth as a sustainable system provided that renewable resources are not used at a faster rate than they are replaced or recycled.

4 Define Ecosystem A network of interactions linking living (biotic) and non-living (abiotic) things

5 Define Closed System A system in which there is no, or very little, input of new materials from the outside. Example: Space Shuttle

6 Earth as a Closed System The earth is a closed system. Very little new matter is being added to Earth except that which arrives from outer space in the form of solar energy, space dust, meteorites, or other heavenly bodies.

7 How is planet Earth like a spaceship? 1. Only the sun’s energy can enter along with the occasional meteorite and all that can escape is energy in the form of heat.

8 How is planet Earth like a spaceship? 2. Many of Earth’s resources such as topsoil, forests, grasslands, and wildlife are renewable.

9 How is planet Earth like a spaceship? 3. Many of the resources on Earth that are used by man are nonrenewable and in short supply.

10 Name conditions that are necessary to maintaining a healthy fishery 1. Quota 2. Season 3. Limited number of harvesters 4. Type of fishing gear 5. Limiting predators