| APES Chapter 22: Solid and Hazardous Waste | 18 | April 24, 2012 |
| APES Chapter 21: Water Pollution | 16 | April 19, 2012 |
| APES Chaper 20: Climate Change and Ozone Depletion | 14 | April 11, 2012 |
| Chapter 17: Energy Efficiency and Renewable Energy | 9 | March 15, 2012 |
| Chapter 16: Nonrenewable Energy | 16 | March 7, 2012 |
| Chapter 15: Geoglogy and Nonrenewable Mineral Resources | 22 | February 22, 2012 |
| APES Chapter 18 | 16 | February 7, 2012 |
| APES Chapter 13 | 32 | February 1, 2012 |
| APES Chapter 14 | 16 | January 19, 2012 |
| APES Chapter 10 | 15 | January 18, 2012 |
| APES Chapter 12 Sustaining Aquatic Species | 8 | December 11, 2011 |
| APES Chapter 11 Sustaining Biodiversity | 11 | December 6, 2011 |
| APES Chaper 9- Human Populations | 12 | November 28, 2011 |