1. Other Threats to Sustainability

2.  Matter and energy are recycled throughout Earth’s systems:  Lithosphere, hydrosphere, atmosphere, biosphere.  Water cycle, carbon cycle, nitrogen cycle, phosphorus cycle, etc.  No new matter has ever been created.

3.  Octonauts Octonauts 0:40 to 2:30

4.  Nutrient levels in aquatic ecosystems increase, leading to an increase in plant growth.  Algae bloom  Caused by run off of nitrogen and phosphorus into waterways (usually from fertilizer use).

5.  Process:  Nitrogen and phosphates from fertilizers and sewage run-off into water.  Nutrients stimulate excessive algae growth.  Algae bloom blocks sunlight, prevents deeper plants from growing, they die.  Algae dies off, sink to bottom, decomposed by bacteria.  Bacteria use up all the oxygen.  Other fish die due to lack of oxygen.

7.  Prevent heat from leaving the atmosphere, thus increasing the temperature of the atmosphere.  Carbon Dioxide, Methane.  Greenhouse effect.

8.  The burning of fossil fuels involves a chemical reaction that uses up oxygen and releases carbon dioxide into the atmosphere.  Coal, Petroleum, Natural Gas