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Atmospheric Sciences
Global Warming

How would the amount of carbon dioxide in the atmosphere change if there were no animals?


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June 11, 2011 7:41AM

Animals, including man, add carbon dioxide to the atmosphere by breathing it out, and by decomposing, when dead. Man also adds CO2 to the atmosphere by burning fossil fuels (coal, oil and natural gas), and by destroying forests.

If there were no animals, including man, then the trees and other vegetation would grow again, with little to destroy them. Trees would absorb and store carbon, and the levels of carbon dioxide in the atmosphere would come down again to more like what they were like before the Industrial Revolution.


If there were no animals on earth all of the plants would die because plants need to take in carbon dioxide to live and produce oxygen for animals so all of the plants would die.