Here are some useful weblinks that may come in handy for review.
The story of stuff:
https://www.youtube.com/watch?v=gLBE5QAYXp8
Oil Sands:
https://www.youtube.com/watch?v=qjA7_wgofp4
Crude Impact:
https://www.youtube.com/watch?v=bvyDH8-y-AE
Overpopulation is a myth;
https://www.youtube.com/watch?v=OiVrYLQXsUk