Scientists have discovered how the Earth’s climate has changed over 66 million years by analyzing marine debris.
The team found four different climatic states: hothouses, hamhouses, coolhouses, and icehouses.
The tilt of the Earth’s axis and the shape of its orbit around the Sun influence these states, each with a clear response to orbital changes, the researchers said.
Based on their findings, published in the journal Science, Team Senogrid has developed a climate reference curve to show continuous records of the past and how climate has changed since the extinction of dinosaurs.
Co-author of the study at UCL Earth Sciences in London, Dr. Anna Joy Drury said: “We use the Senogrid to understand what the Earth’s normal climate change and variation are and how quickly the Earth has recovered from past events.
“When we show that the Earth has experienced warmer climates before, these were characteristic of climate change, which was quite different from our modern world.”
Samples collected from sea level for more than five decades were analyzed by an international research team.
Scientists have performed a mathematical analysis to identify four climatic conditions associated with changes in greenhouse gas emissions.
For example, researchers say that during the Paleocene-Eocene Thermal Maximum (PETM) period, about 55 million years ago, rapid global warming caused the climate to become a hot state, which is associated with the release of large amounts of carbon into the atmosphere.
During the Eocene, about 34 million years ago, ice sheets began to form in Antarctica as atmospheric carbon dioxide levels declined and the climate changed to a coolhouse state.
He is the author of the Bremen Center for Marine Environmental Sciences in Germany. Thomas Westerhold said: “We now know more precisely when the planet was hotter or colder, and better understand the inherent dynamics and the processes that lead to it. Those ones.
“Of particular interest is the fact that 66 to 34 million years ago, the planet was significantly warmer than it is today, because it represents a parallel to the past that could lead to future anthropogenic changes.”
According to researchers, the Earth’s climate has been an ice house for the past three million years, with hot and cold seasons.
They say greenhouse gas emissions and other anthropogenic, or human-led activities are leading the planet into warmer, hotterhouse climates that have not been seen since the Eocene period.
Dr. Drury added: “Since the hothouse’s warmest climate, the Earth’s climate has been steadily cooling over the last 50 million years, but the current and predicted rapid racial changes are reversing this trend, and more than the natural variation of the last 66 million years. ”