Climate Change
Texto del Guión Gráfico
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- Mr. Buntain, what was the largest extinction event in history?
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- Well, Jay, that would be the Permian extinction!
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- What happened during that period leading up to the extinction?
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- The Permian period first began quite cold and humid from great glaciation the period before. However, massive volcanic activity from what is now Siberia released large amounts of greenhouse gases into the atmosphere and increased temperatures globally. Because of volcanic ash covering the skies, plants were also less efficient in photosynthesis and expelled less oxygen.
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- Temperatures rapidly rose throughout the period, with sea surface temperatures going from 22-25 degrees celsius all the way up to 30 degrees celsius. Temperature increases also resulted in sea levels rising as ice melted across the Earth. Not only that, but increased greenhouse gases also acidified oceanwater on Earth.
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- What happened to life on Earth?
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- The increase in temperature and greenhouse gases coupled with low oxygen levels led to the extinction of around 95 percent of marine species and 70 percent of land species.
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