What if Antarctica was once a place without ice, with forests and a climate much warmer than today? Understand when this happened, the role of CO2 in this transformation, and how this unexpected past helps to predict the future of the planet.

Written by Caio Aviz

Published on 20/04/2026 at 13:40

Updated on 20/04/2026 at 13:41

Seja o primeiro a reagir!

Understand when Antarctica was ice-free, how CO2 influenced freezing, and what this indicates about the global climatic future

Antarctica has not always been covered in ice, and this fact has drawn the attention of scientists for decades.

Currently, the continent is dominated by an extensive ice sheet several kilometers thick.

However, geological records analyzed by institutions such as British Antarctic Survey and NASA show that forests, exposed soils, and cold-adapted vegetation once existed in the region.

ARTICLE CONTINUES BELOW

Climate transition marked the end of ice-free Antarctica

The last time Antarctica was mostly free of ice was about 34.4 million years ago, during the transition between the Eocene and Oligocene.

Before this period, the planet had higher temperatures and did not have large permanent ice sheets.

Consequently, Antarctica exhibited landscapes similar to tundras and cold forests of the Northern Hemisphere.

In this context, diverse ecosystems developed, with species that are now extinct.

Thus, the continent had characteristics very different from today.

CO2 levels were decisive for freezing

Carbon dioxide played a fundamental role in the formation of ice sheets.

Between 60 and 50 million years ago, CO2 levels were significantly higher than today.

As a result, the natural greenhouse effect was intensified, keeping the planet warm.

Over time, natural processes reduced these CO2 levels.

As a result, a progressive global cooling occurred.

According to climate studies, several factors were decisive in this process:

Gradual decrease of CO2 associated with the weathering of rocks
Reflection of solar radiation by snow-covered surfaces
Expansion of glaciers, altering sea level
Release of coastal carbon, influencing climate balance

Thus, the planet entered a colder phase, favoring the formation of ice.

https://clickpetroleoegas.com.br/terra-puxa-agua-dos-oceanos-para-o-nucleo-a-3000-km-e-cientistas-explicam-processo-profundo-da-terra-caes/

Drake Passage changed ocean dynamics

In addition to CO2, the position of the continents played an important role in this transformation.

The separation between South America and Antarctica gave rise to the Drake Passage.

This event allowed for the formation of the Antarctic Circumpolar Current, as described by oceanographic studies.

This current acts as a ring of cold water around the continent.

Thus, it prevents the entry of warm waters from lower regions.

As a consequence, thermal isolation intensifies the cold and favors ice.

Among the main observed effects are:

Thermal isolation of Antarctica
Blocking of warm air and humidity
Ideal conditions for ice expansion
Changes in the carbon cycle

Therefore, the reorganization of the oceans was essential in this process.

Will Antarctica be ice-free in the future?

From a geological perspective, Antarctica may become ice-free again in a very distant future.

In the past, Earth had CO2 levels higher than current levels.

Under those conditions, the climate was warmer and there was no permanent ice at the poles.

Today, part of this possibility is related to human emissions of greenhouse gases.

However, climate models indicate that the complete melting of the Antarctic ice sheet is not expected to occur in a few centuries.

Still, partial losses would already be sufficient to raise sea levels by several meters.

Therefore, the past of Antarctica serves as an important natural record.

This data helps scientists understand the sensitivity of glaciers to temperature changes.

Moreover, it guides limits to reduce future risks in the 21st century.

In light of this climatic history, how much can small current changes influence the future of the planet’s major glaciers?

0 Comentários

Mais recente

Mais antigos Mais votado

Feedbacks

Visualizar todos comentários

What if Antarctica was once a place without ice, with forests and a climate much warmer than today? Understand when this happened, the role of CO2 in this transformation, and how this unexpected past helps to predict the future of the planet.

Understand when Antarctica was ice-free, how CO2 influenced freezing, and what this indicates about the global climatic future

Climate transition marked the end of ice-free Antarctica

CO2 levels were decisive for freezing

Drake Passage changed ocean dynamics

Will Antarctica be ice-free in the future?

While in Brazil a 10-story building takes 2 years to complete, in China a company stacks pre-fabricated modules and raises the entire building in just 28 hours and 45 minutes.

BRICS is preparing a payment system inspired by the Brazilian PIX that will allow direct transactions between countries using national digital currencies without relying on the dollar or Western banks as intermediaries.

The oldest tree in the world, alive since before the birth of Jesus Christ, is cut down in a scientific study and the case changes environmental preservation rules.

After ten days orbiting the Moon, science confirms that the astronauts of the Artemis II mission return with altered bodies.

On the coast of China, fishermen received an official reward after finding 10 foreign underwater devices capable of “stealing secrets” in just two years, showing that the silent war for the seabed has already reached the nets of those who rely on fishing.

An entire island in the Pacific wants to surround itself with a colossal barrier against the ocean to try to escape increasingly violent waves and not be swallowed by the sea in the coming decades.

After decades of selling cushioning and extreme protection, the new craze in trails and hiking shoes is precisely taking off your shoes.

A Neptune-sized planet 260 light-years away reflects up to 80% of the light from its star, with clouds of titanium and silicates, orbits in less than 1 day, and challenges the existence in the so-called hot Neptune desert.

Renewable energy companies suspend R$ 40 billion and consider leaving the Northeast after rising costs and cuts in generation.

Mr. Geraldo, at 99 years old, leaves the city and walks about 9 km on a dirt road until he reaches the farm, where he maintains a routine in the countryside, takes care of the animals, engages in rural activities, and preserves traditional practices.

A planet the size of Earth is being “cooked” before scientists: HD 63433 d has a year equivalent to 4.2 days, may have half of its surface covered in lava, and reaches about 1,257°C in a hemisphere locked by the star.

The railway involved in one of the largest wars ever fought in southern Brazil may resume operations after three decades of inactivity, and the federal government has already begun to study its feasibility.

What if Antarctica was once a place without ice, with forests and a climate much warmer than today? Understand when this happened, the role of CO2 in this transformation, and how this unexpected past helps to predict the future of the planet.

Understand when Antarctica was ice-free, how CO2 influenced freezing, and what this indicates about the global climatic future

Climate transition marked the end of ice-free Antarctica

CO2 levels were decisive for freezing

Drake Passage changed ocean dynamics

Will Antarctica be ice-free in the future?

While in Brazil a 10-story building takes 2 years to complete, in China a company stacks pre-fabricated modules and raises the entire building in just 28 hours and 45 minutes.

BRICS is preparing a payment system inspired by the Brazilian PIX that will allow direct transactions between countries using national digital currencies without relying on the dollar or Western banks as intermediaries.

The oldest tree in the world, alive since before the birth of Jesus Christ, is cut down in a scientific study and the case changes environmental preservation rules.

After ten days orbiting the Moon, science confirms that the astronauts of the Artemis II mission return with altered bodies.

On the coast of China, fishermen received an official reward after finding 10 foreign underwater devices capable of “stealing secrets” in just two years, showing that the silent war for the seabed has already reached the nets of those who rely on fishing.

An entire island in the Pacific wants to surround itself with a colossal barrier against the ocean to try to escape increasingly violent waves and not be swallowed by the sea in the coming decades.

After decades of selling cushioning and extreme protection, the new craze in trails and hiking shoes is precisely taking off your shoes.

A Neptune-sized planet 260 light-years away reflects up to 80% of the light from its star, with clouds of titanium and silicates, orbits in less than 1 day, and challenges the existence in the so-called hot Neptune desert.

A planet the size of Earth is being “cooked” before scientists: HD 63433 d has a year equivalent to 4.2 days, may have half of its surface covered in lava, and reaches about 1,257°C in a hemisphere locked by the star.

An American company presents a project for an inflatable house for the Moon that can expand up to 20 times in space, and the technology promises to revolutionize the way humans will live and work outside of Earth.

Intense storms and a ‘potential danger’ alert in RS: a cold front advances with winds of up to 60 km/h, hail, and a week marked by heavy rains and concerning climatic instability.

Inmet issued a red alert for a heatwave that will affect four Brazilian states for seven consecutive days with temperatures 5°C above average, and the phenomenon may last until the end of May.

A Neptune-sized planet 260 light-years away reflects up to 80% of the light from its star, with clouds of titanium and silicates, orbits in less than 1 day, and challenges the existence in the so-called hot Neptune desert.

Renewable energy companies suspend R$ 40 billion and consider leaving the Northeast after rising costs and cuts in generation.

Mr. Geraldo, at 99 years old, leaves the city and walks about 9 km on a dirt road until he reaches the farm, where he maintains a routine in the countryside, takes care of the animals, engages in rural activities, and preserves traditional practices.

A planet the size of Earth is being “cooked” before scientists: HD 63433 d has a year equivalent to 4.2 days, may have half of its surface covered in lava, and reaches about 1,257°C in a hemisphere locked by the star.

The railway involved in one of the largest wars ever fought in southern Brazil may resume operations after three decades of inactivity, and the federal government has already begun to study its feasibility.