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6.      http://news.bbc.co.uk/1/hi/sci/tech/7933589.stm

7.      http://www.ec.gc.ca/WATER/images/manage/qual/a3p7e.htm\

8.      http://ucsdnews.ucsd.edu/graphics/images/2009/01-09OceanAcidification03.jpg]

9.      http://ucsdnews.ucsd.edu/graphics/images/2009/01-09OceanAcidification03.jpg

10.  http://blogs.nature.com/.../ocean_science/

11.  http://www.sciam.com/media/inline/ocean-acidification-hits-great-barrier-reef_1.jpg

12.  http://en.wikipedia.org/wiki/File:Oa-sami.jpg

13.  http://www.jadedthea.com/images/carbon_cycle_416.gif

14.  http://en.wikipedia.org/wiki/File:AYool_GLODAP_aCO2.png

15.  http://en.wikipedia.org/wiki/File:AYool_GLODAP_invt_aCO2.png

16.  http://en.wikipedia.org/wiki/File:AYool_GLODAP_del_co3.png