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2023 - Accelerating melt of ice sheets now unmistakable.

Greenland Ice Sheet

Warmer air is melting the top of the Greenland Ice Sheet

If you could shape an ice cube out of all the ice losses from Greenland and Antarctica over the past three decades, it would stand 20km high.

An international group of scientists who work with satellite data say the acceleration in the melting of Earth's ice sheets is now unmistakable.

They calculate the planet's frozen poles lost 7,560 billion tonnes in mass between 1992 and 2022.

Seven of the worst melting years have occurred in the past decade.

Mass loss from Greenland and Antarctica is now responsible for a quarter of all sea-level rise.

This contribution is five times what it was 30 years ago.

The latest assessment comes from the Ice Sheet Mass Balance Intercomparison Exercise, or Imbie.

Mercury exposure linked to dramatic decline in Arctic foxes

arctic fox
arctic foxes

According to the research, the levels of mercury found in Arctic foxes depend on their diets

Scientists say that foxes in Arctic regions who feed on ocean prey are being exposed to dangerous levels of mercury.

On one Russian island where the population of foxes has crashed, the researchers believe the toxin has played a key role in the decline.

They say the findings could have important implications for conservation.

The data is published in the Journal, PLOS ONE.

Mercury levels in the world's oceans have doubled over the past 100 years, according to the UN, with more mercury deposited in the Arctic than on any other part of the planet.

The Arctic Council says there has been a ten-fold increase in the levels of mercury found in top predators in the region over the past 150 years.

Hair of the dog

Now a team of researchers says it has found significant levels of mercury in different populations of Arctic foxes in different environments.

On the small Russian island of Mednyi, part of the Commander Islands chain in the North Pacific Ocean, the foxes survive almost exclusively on sea birds with some also eating seal carcasses.

The island's fox population declined mysteriously in the 1970s, and while the population is currently stable many of them are in poor condition, and have low body weight. They are listed as a critically endangered species with IUCN.

Scientists at one time believed their shrinking numbers were caused by an infection, but they couldn't find the underlying cause.