Bigger Temperature Changes Linked to Larger Extinction Events, Japanese Researcher Claims

The largest mass extinction on Earth occurred about 250 million years ago and lasted over 60,000 years

Bigger Temperature Changes Linked to Larger Extinction Events, Japanese Researcher Claims

Photo Credit: NASA/Thomas W. Johansen

A polar bear on a glacier captured by NASA's Oceans Melting Greenland field mission

Highlights
  • Research has uncovered a link between climate change and biodiversity
  • Temperature changes are said to lead to an increase in extinction extent
  • The largest mass extinctions happened at 9 degrees Celsius of warming

Evidence discovered by a professor emeritus at Tohoku University in Japan indicates a high correlation between the size of mass extinctions and historical fluctuations in the Earth's temperature. Kunio Kaiho, the climate expert, claims that the current major extinction event will not compare to the previous five — certainly not for several more centuries. Earth has lost most of its species on numerous occasions over the past 540 million years in a relatively small geologic time period. These are known as mass extinction events, and they typically occur due to climate change.

Kaiho found that there was a linear link between the stability of the Earth's average surface temperature and its biodiversity. He discovered that temperature change led to an increase in extinction extent.

The greatest mass extinctions during global cooling episodes happened when temperatures dropped by roughly 7 degrees Celsius. However, Kaiho discovered that during times of global warming, the largest mass extinctions happened at about 9 degrees Celsius of warming.

That is significantly higher than earlier predictions, which indicated that a temperature increase of 5.2 degrees Celsius would cause a significant marine mass extinction on par with the previous big five.

To put that in perspective, contemporary global warming is projected to raise surface temperatures by as much as 4.4 degrees Celsius by the end of the century.

“These findings indicate that the bigger the shifts in climate, the larger the mass extinction. They also tell us that any prospective extinction related to human activity will not be of the same proportions when the extinction magnitude changes in conjunction with global surface temperature anomaly,” said Kaiho.

Kaiho's study was published in the journal, Biogeosciences.

In the worst case, Kaiho asserted that the 9 degrees Celsius global warming will not appear in the Anthropocene at least till 2500.

Many species are already becoming extinct as a result of climate change, however, Kaiho does not predict as many losses as in the past. However, the threat to species is not limited to the severity of climate change. It is important to consider how quickly it happens.

The largest mass extinction on Earth occurred about 250 million years ago and lasted over 60,000 years. It resulted in the extinction of 95 percent of all known species at the time. But because of human emissions of fossil fuels, today's warming is taking place over a considerably shorter period.

In addition, Kaiho discovered that terrestrial tetrapods were less resilient to the effects of climate change than marine creatures. However, compared to terrestrial animals, marine creatures were less tolerant of changes in environmental temperature. This is because the anomalous temperature on land is 2.2 times greater than the sea surface temperature. 

Because the reasons of the anthropogenic extinction are different from the causes of mass extinctions in geologic time, Kaihu acknowledges that it is difficult to predict the future anthropogenic extinction magnitude using simply surface temperature. No matter how scientists analyse the evidence, it is obvious that unless we can stop climate change, many species are doomed.


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