Researchers analyzed samples from the top three meters of permafrost in the Yukon River.

• After comparing samples to satellite data, they found that "significant" amounts of mercury is released when riverbanks erode.

About Permafrost:

• It is any ground that remains frozen (0℃) or colder for at least two years straight.
• It is made up of a combination of soil, rocks and sand, held together by ice.
• It is common in regions of high mountains and along Earth’s higher latitudes- Arctic and Antarctica.
• Permafrost regions are not always covered in snow despite the ground being frozen.

Impact of melting of Permafrost:

• Decomposition of Soil Organic Carbon stored in permafrost, releasing GHGs like carbon dioxide and methane into the atmosphere.
• Thawing permafrost releases ancient bacteria and viruses posing health threats to humans and animals.
• Direct threat to over 5 million people living in the Arctic region due to potential release of mercury.
• Sea level rise and increased erosion and risks of landslides.