Mankind will toss the Earth for three million years, said scientists

The Earth's climate could "go back" for a few million years, say scientists from the University of Southampton. Their findings are published in the journal Scientific Reports.

As noted by the authors, by 2025, the level of carbon dioxide in the atmosphere may be a record for the past 3.3 million years. Scientists managed to establish this by analysing the chemical composition of fossils from the bottom of the Caribbean sea.

They reconstructed the CO2 concentration in the air three million years ago — at the dawn of the Pliocene epoch. Then the temperature on Earth was three degrees warmer and sea levels higher.

To estimate the concentration of carbon dioxide in ancient times, scientists have determined the ratio of boron isotopes in the fossilized shells of foraminifera. This rate depends on the acidity of seawater, and it, in turn, determines the content of CO2 in the atmosphere.

The study found that in the warmest period of the Pliocene carbon dioxide concentration in the atmosphere has fluctuated in the framework of 380-420 ppm. Now the figure is 415 ppm. This confirms that human influence has brought the Earth to the point at which there are significant climate shifts.