![Dandelion (Taraxacum sp) growing on wasteland by derelict, graffiti-covered building, Bristol, UK](http://insanitek.net/knowledge/wp-content/uploads/2015/11/urban_ecosystem_1-570x350.jpg)
Unit 9: Urban Ecosystems
![A landfill in Portugal, images taken by Tim van Nus.](http://insanitek.net/knowledge/wp-content/uploads/2015/06/February_2012_III_Aveiro_eo-001-570x350.jpg)
Unit 9: Waste Management
![Guy with a mac](http://insanitek.net/knowledge/wp-content/uploads/2015/06/Guy-with-a-mac-570x350.jpg)
Unit 8: Renewable and Non-Renewable Energy
![Oranges](http://insanitek.net/knowledge/wp-content/uploads/2015/06/Oranges-570x350.jpg)
Delve deeper into the world of agriculture and waste water management. We are going to see how the environment provides for us and how we keep it clean after the fact.
Unit Seven: Food & Water
![elevation_lattitude__climate_biome](http://insanitek.net/knowledge/wp-content/uploads/2015/04/elevation_lattitude__climate_biome-570x350.png)
Unit Six: Geography and Terrestrial Life
![tropical beach wallpaper](http://insanitek.net/knowledge/wp-content/uploads/2015/04/tropical-beach-wallpaper-06129-570x350.jpg)
Unit Five: Air Quality and Climate
![Many intersecting ripples; can you count how many intersect?](http://insanitek.net/knowledge/wp-content/uploads/2015/04/water-ripples-570x350.jpg)
Unit Four: Communities and Their Ecology
![A large crowd of people.](http://insanitek.net/knowledge/wp-content/uploads/2015/04/crowd-of-people-570x350.jpg)
Unit Three: Human Populations and Growth
![ap-environmental-science_119877_small](http://insanitek.net/knowledge/wp-content/uploads/2015/03/ap-environmental-science_119877_small.jpg)