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Title: The atmospheric carbon dioxide concentration Post by: adreamer on Sep 10, 2017 The atmospheric carbon dioxide concentration
A) is higher than it has been at any time during the last 800,000 years B) is higher than it has been at any time during the Earth's history C) has remained roughly constant during the last 800,000 years D) is lower than it has been at any time during the last 800,000 years Title: Re: The atmospheric carbon dioxide concentration Post by: 19Clyde on Sep 10, 2017 Content hidden
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