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Earth's oxygen levels are declining - and scientists aren't sure why

by LiveModern Webmaster last modified Oct 04, 2016 01:07 AM
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by Lacy Cooke last modified Sep 30, 2016

Related: The world will run out of breathable air unless carbon emissions are cut Via Forbes Images via Wikimedia Commons (1,2)




 

 


 

 

 
 
 
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