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A new study from the Polytechnic University of Turin, published in Science Advances, one of the Science group's leading international open-access scientific journals, sheds light on one of the most pressing climate change questions: what will happen to the ocean currents that regulate Europe's climate? The study concentrates on the Atlantic Meridional Circulation (AMOC), a vast network of ocean currents that includes the Gulf Stream and is instrumental in the regulation of Europe's climate, assuring that temperatures remain comparatively mild throughout the continent. For years, scientists have wondered how global warming would affect the AMOC, and whether this system could reach a tipping point beyond which its weakening would be quick and difficult to reverse. Some simplified models posit that this process could be facilitated by a significant influx of freshwater into the North Atlantic, such as that induced by the melting of the Greenland ice sheet. However, many of the climate models now used to anticipate climate evolution do not explicitly account for this occurrence. As a result, some researchers feel the risk of a significant weakening of the Atlantic circulation is underestimated. The study's findings alleviated some of these fears. Although the melting of the Greenland ice sheet is expected to contribute to further weakening of the AMOC, the researchers found no evidence of a sudden collapse of circulation caused by ice melt in their climate model, at least in the foreseeable future, even under a scenario characterized by rapid global warming. This discovery does not relieve fears about climate change, but it does provide a better understanding of how one of Earth's primary climate regulating systems may evolve over time. The findings demonstrate that meltwater contributes to the continued weakening of the AMOC, reducing its strength by an additional 10-20% by the end of the century. However, unlike what some simple models predict, this process does not result in a rapid and abrupt collapse of the Atlantic circulation. However, the weakening is slow, accompanied by rising global temperatures and the progressive rise of climate change. Although the melting of Greenland's ice sheet does not appear to be enough to precipitate a dramatic collapse of the Atlantic circulation, climate change continues to disrupt the Earth's equilibrium. As a result, the research findings are clear: lowering greenhouse gas emissions remains the top goal. Only effective mitigation strategies can limit the effects of global warming and lower future threats to the climate, ecosystems, and human societies.
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