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A comment on What If We Haven’t Met Aliens yet Because They’ve Messed Up Their Planets Too?. Parent comment

Re:What If We Haven’t Met Aliens yet Because They’ve Messed ... by dmead on Saturday August 03, 2019 @08:07PM (#20603571)
isn't most of the breathable oxygen produced by phytoplankton in the oceans?
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Re:What If We Haven’t Met Aliens yet Because They’ve Messed ... by smegger001 on Saturday August 03, 2019 @08:13PM (#20603612)
and the taiga/boreal forest of the far north.
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