A: The primary source of increased carbon dioxide in the atmosphere today is people. We perturb the carbon cycle by burningfossil fuels and clearing land.Effects of Changing the Carbon Cycle20. List the three greenhouse gases that absorb a wide range of energy.A: Carbon dioxide, methane, and halocarbons.21. Describe the Earth without greenhouse gases.A: The Earth without greenhouse gases would be frozen.Methane CH422. Describe the Earth with too many greenhouse gases.A: With too many greenhouse gases Earth would be like Venus, where temperatures are kept around 400 degrees.23. When carbon dioxide concentrations drop, in Earth’s atmosphere, what happens to water vapour?A: Water vapour drops from the atmosphere and earth cools down.24. What percentage of the carbon dioxide that people have put intothe atmosphere has diffused into the ocean?A: about 30%25. This has caused what percentage change in the oceans’ acidity?A: A 30% change.26. Describe the first way that ocean acidification affects marine organisms.A: Carbonic acid reacts with the carbonate ions in the water to form bicarbonate. Those same ions are the same ones coral need to produce calcium carbonate shells.
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27. Describe the second way that ocean acidification affects marine organisms.A: In the long run the ocean will be able to soak up more carbon dioxide causing the water to become more acidic, which will break down rocks releasing more carbonate ions, and eventually it will destroy the carbonate shells of marine life.28. Plants have taken up what percentage of the carbon dioxide thathumans have put into the atmosphere?
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