The Circumpolar Current works as a regulator of the planet's climate. Its origins were thought to have caused the formation of the permanent ice in Antarctica about 34 million years ago. Now, a study led by the University of Barcelona, the Instituto Andaluz de Ciencias de la Tierra (CSIC) and the Imperial College London (United Kingdom) has cast doubt on this theory, and has changed the understanding of how the ice sheet in Antarctic developed in the past, and what this could mean in the future as the planet's climate changes.

The article, published in the journal Nature Geoscience, breaks with the classical view on the origins of the Antarctic Circumpolar Current, the largest marine current on Earth and which is decisive in the ocean circulation and climate change.

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Greenland absorbs more of the greenhouse gas methane than it emits, according to a new study from the University of Copenhagen released Wednesday.

"On average and since 2000, dry landscapes of the ice-free part of Greenland have consumed more than 65,000 tons of methane annually from the atmosphere, while 9,000 tons of methane have been released annually from its wet areas," the university said in a statement.

The findings, which were published in the journal Nature Communications Earth & Environment, are encouraging because methane, the second-biggest contributor to global warming after CO2, is particularly harmful to the environment.

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