Part 1: It Comes From the Sea
http://marinebio.org/oceans/ocean-resources/
Part 2: Human Impact on Oceans
http://www.greenpackonline.org/english/global-challenges.php?id=18-03
Part 3: DDT
https://antarcticsun.usap.gov/science/contenthandler.cfm?id=1436
Part 4: Rigs to Reefs
http://tpwd.texas.gov/landwater/water/habitats/artificial_reef/overview.phtml#rr
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