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by Sheila McNulty
http://blogs.ft.com/energy-source/2010/06/29/oil-spill-in-gulf-could-cause-dead-zone-further-hitting-sealife/
High concentrations of methane gas - in some cases approaching 1m times the normal level - have been found around the BP oil spill, raising fears it could create an oxygen-depleted “dead zone” where marine life cannot survive.
Dead zone: This image from NOAA shows the dead zone in the Gulf of Mexico. (NOAA)