In the new study, the authors examined paleoclimate data over the past 66 million years, specifically the Cenozoic
Scientists found that during this periodfluctuations in the Earth's climate have surprisingly tended to constantly rise in temperature. In other words, there have been many more periods of prolonged global warming that lasted from thousands to tens of thousands of years. Moreover, these periods tended to be more extreme in terms of temperature changes.
Researchers say warming is likelythis increased due to the so-called multiplier effect: in this case, a moderate degree of warming, for example, due to volcanoes emitting carbon dioxide into the atmosphere, accelerates certain biological and chemical processes, and as a result, warming increases even more.
The authors note that this warming trend has disappeared about 5 million years.years ago, around the time that ice sheets began to form in the Northern Hemisphere.It is not yet known what effect the ice had on the cooling of the Earth.also lead to a multiplier effect.
In the course of the work, the authors turned to large databases of deep-sea organisms whose shells are preserved in sediments.The composition of these shells depends on the temperature of the ocean, so they are considered to bea reliable indicator of changes in the Earth's temperature over a long period of time.
The team conducted a statistical analysis of the data and noticed that over the past 66 million years,In particular, the temperature was extreme and fluctuated frequently, unlikeperiods of cooling.
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