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Atmospheric carbon dioxide levels have reached very high values in the deep past, possibly topping over..(1)...in the Cambrian period around 500 million years ago. Its lowest concentration has probably been over the last 2 million years during the ....(2)....glaciation when it sank to about...(3)...

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1. Atmospheric carbon dioxide levels have reached very high values in the deep past, possibly topping over..(1)...in the Cambrian period around 500 million years ago. Its lowest concentration has probably been over the last 2 million years during the ....(2)....glaciation when it sank to about...(3)...





 
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