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Home Q & A Board Biology-Related Homework Help Environmental and Conservation Biology
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Alamojay Alamojay
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9 years ago
Current levels of atmospheric carbon dioxide are
A) remaining high but steady.
B) nearly 400 ppm, higher than they have been in 800,000 years.
C) fluctuating greatly but are starting to increase again after a downward trend in the 1990s.
D) decreasing because surplus carbon dioxide is being absorbed by the arctic permafrost.
Textbook 
Environmental Science: Toward A Sustainable Future

Environmental Science: Toward A Sustainable Future


Edition: 12th
Authors:
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Super Cuban Dude
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JesuisMelJesuisMel
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9 years ago
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