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JOHN P. HOLDREN: Climate change is rapidly transforming the Arctic: Why everybody should care

June 10, 2021 — The part of Earth’s surface lying north of the Arctic Circle encompasses an area of 7.7 million square miles, of which 70 percent is open or ice-covered ocean. Only eight nations possess territory or territorial waters in this region: the United States (because of Alaska), Canada, Russia, Finland, Norway, Sweden, Iceland and Denmark (because of Greenland). A mere 4 million people inhabit the Arctic. Indigenous people make up about 10 percent of the total, spread across two dozen ethnolinguistic groups (e.g., Inuit, Aleut, Saami).

Beyond its value to the people who live there, however, the Arctic has long been recognized as having considerable importance beyond the region. It is significant militarily, because of the Arctic’s location, linking all of the world’s northern land masses. It’s also significant economically for its oil, gas, strategic metals, and ocean fisheries; and it’s prized around the world, even by people who will never see it in person, for its spectacular landscapes and wildlife.

For the last couple of decades, though, climate change has been transforming practically everything about the Arctic that matters to people both inside and outside of the region. That’s because the Arctic as a whole has been warming two to three times faster than the rest of the world. The accumulating effects of this extreme warming are now manifesting themselves in a multiplicity of ways, some of them creating new economic opportunities, but practically all of them creating major physical, socioeconomic and management challenges for the region. And, of greatest importance for rest of the world, the rapid pace of climate change in the Arctic is influencing the pace and impacts of climate change elsewhere.  It even threatens to undermine the ability of society’s emissions reductions to stop warming worldwide at a level that avoids wholly unmanageable consequences.

Read the full opinion piece at The Hill

Acid threatens almighty cod

November 30, 2018 —Climate change could devastate a major northern hemisphere fishing industry, modelling finds.

For cod facing the effects of climate change, it’s not the heat but the acid that threatens.

Ocean acidification – caused by atmospheric carbon dioxide entering the water and lowering its pH value – means there’s a narrower thermal window for the success of two species of northern cod, meaning that one of the world’s largest fisheries will be threatened if global temperature increases are not limited to 1.5 degrees Celsius, a new study finds.

The researchers, led by Flemming Dahlke of the Alfred Wegener Institute in Germany, find that embryos of cod are able to survive only within a limited temperature range, and that the range lessens in more acidic conditions.

The researchers predict that Atlantic cod (Gadus morhuai) would be unable to spawn below the Arctic Circle by 2100 under a “business as usual” emissions scenario. The polar cod (Boreogadus saida) faces an even more perilous future, since it not only needs colder water, but also depends on ocean ice for its habitat.

Read the full story at Cosmos Magazine

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