All the ingredients for a mass extinction now exist as far back as 250 million years ago!

Earth’s largest mass extinction was caused by massive CO emissions2 and the resulting climate change. At the same time, bacteria and algae spread in the water. Doesn’t this remind you of something? Maybe the same thing is happening now.

From mass extinction, ns Terre Already knows five. At least 75% of them. characterized by the disappearance of cash Animals or plants living on our planet. Whether on dry land or at the bottom of the ocean. The most important of these was the so-called Permian-Triassic, which was about 250 million years ago. That time, emissions Volcano green house gas Revised Season of our planet. rate of carbon dioxide (CO .)2) in lClimate Earth has been multiplied by 13! The average temperature then dropped to 25 to 40 °C. About 95% of marine life and 70% of life on land have disappeared.

From University of Connecticut researchers (United States) teach us today that parallel to Climate change, From bacteria And algae They have thrived in water for hundreds of thousands of years. participating at their levelmass destruction Working. because it micro-organisms, when their numbers become significant, they eliminate the oxygen present in the water. and also released toxins.

Analysis of fossils, sediments and chemical records from rocks near Sydney (Australia) actually shows that the first outbreaks of these microbes volcanic eruptions Identified as the main culprit for the Permian-Triassic mass extinction. Because once the animals that ate them disappeared, there was no one left to control them. in the systemPure water Filled with algae and bacteria, life was slow to recover.

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the worst can still be avoided

Researchers explain that this poisonous soup was composed of three main ingredients: green house gas, high temperature and Nutrients abundantly – from deforestation The volcano is associated with eruptions, a massive deforestation that has resulted in the dumping of soil into rivers and lakes. Searching the fossil record for other mass extinctions, scientists have found similar clues.

What worries them is that the three ingredients they describe are found on today’s Earth. “We know that the CO input rate2 At that time it was observed that CO. was similar to the rate of increase in2 which we see today because of anthropogenic effects”Tracy Frank, a geologist, says, University of Connecticut Press Release. The average temperature of our planet is increasing. And in the water, nutrients driven by agricultural pollution and deforestation are being added. Result, “We are already seeing more and more toxic algae blooms in lakes and shallow marine environments”, notes Tracy Frank. Permian-like creatures by them Texture, their filamentous structure, their fluorescence and their concentration. and which thrive in fresh water with a temperature between 20 and 32 °C. Provided range for accurately averaging latitudes by the end of our century.

Increase in wildfires, another sign

“The other major parallel with the Permian–Triassic mass extinction is that the increase in temperature at that time coincided with a massive increase in Forest fire. They destroyed the entire ecosystem. And it’s repeating itself now in places like California – or Siberia, Australia, Amazonia », also says study author Chris Fielding.

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So today we’re living a replica of the past Symptoms The largest mass extinction on Earth. They are signs of an ecosystem in imbalance. But unlike what may have happened in the past, we still have the option to stop or at least slow down the machine. By ensuring the good health of our waterways and limiting our greenhouse gas emissions. Because if we as human beings are used to thinking on very short time scales, then we should not pay attention to the fact that “Life on Earth took four million years to recover from the Permian-Triassic mass extinction”. “It gives food for thought”Chris Fielding concludes.

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