Global warming is not a recent phenomenon. Natural causes in our ancient past drove rapid increases in carbon dioxide and led to mass extinctions. The most severe of these took place 250 million years ago at the end of the Permian Period, possibly due to increased volcanic activity as the supercontinent Pangaea broke apart. Global temperatures rose by up to 5 degrees Celsius and 90% of ocean species were lost. Now global temperatures have risen by almost three-quarters of a degree Celsius over the past 100 years. By looking at the past, professor of earth sciences and biological sciences, David Bottjer, has made three predictions: as oceans absorb more CO2 they will become more acidic causing coral reefs to die off. Ocean circulation will slow due to the hotter atmosphere and, as oxygen levels decrease dead zones will appear, unable to support oxygen-dependent life, like fish. As other forms of life decline the microbes will increase and take over.
Posted by Astrojenny
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