a Earth’s Climate could “go back” several million years ago, say researchers from Southampton University, whose findings were 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 last 3.3 million years, reports RIA “Novosti”.
Scientists managed to establish this by analysing the chemical composition of fossils from the bottom of the Caribbean sea. They also reconstructed the CO2 concentration in the air 3 million years ago – at the dawn of the Pliocene epoch. Then the temperature on Earth was three degrees warmer and sea levels higher.
What will the fight for climate warming
It is clarified that for the assessment of 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.
So, in the course of the study it was 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 climatic shifts, the scientists concluded.
Earlier it was reported that French and Australian geologists have studied the composition of the rock Islands in the southern Indian ocean and found that there is the formation of “embryonic continent.” Scientists suggest that this emerging new continents.