Scientists mapped what happens if a crucial system of ocean currents collapses

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🗞️ Driving the news: A new study using advanced climate modeling warns that a collapse of the Atlantic Meridional Overturning Circulation (AMOC) could trigger catastrophic climate shifts, including extreme cold across Europe
• The research shows that, even in a world warmed by 2°C, parts of Europe could see winter temperatures plunge as low as –55°F, accompanied by intensified storms and sea ice reaching as far south as the UK and Netherlands

🔭 The context: The AMOC is a critical ocean current system that moves warm water northwards in the Atlantic, regulating global weather
• Scientists have long observed signs of weakening, driven by melting ice and increased freshwater disrupting salinity
• While previous research predicted a potential collapse by the 2030s, this study is the first to model the long-term global effects under simultaneous warming scenarios
• The results challenge prevailing assumptions that Europe’s climate will only get hotter

🌍 Why it matters for the planet: A collapse of the AMOC would significantly disrupt global climate systems, reversing warming trends in some regions while exacerbating them elsewhere
• Europe could face prolonged winters and reduced agricultural productivity, straining infrastructure and food systems while North America experience rising sea levels and continued warming
• The findings add urgency to calls for global emissions reductions and closer ocean monitoring to avoid triggering this tipping point

⏭️ What's next: Scientists are calling for enhanced ocean surveillance to track changes in AMOC dynamics
Policymakers may need to incorporate extreme cold scenarios into future resilience planning, particularly in Europe
• Further research using multiple climate models will be essential to refine projections and inform adaptation strategies
• Without intervention, the AMOC could collapse within decades, with cascading and irreversible effects

💬 One quote: “Now policy is planning for a warmer future, but maybe instead, we need to also prepare for a colder future.” — René van Westen, co-author and climate researcher

📈 One stat: London could experience winter cold extremes of –2.2°F, while Oslo may see temperatures below 32°F for nearly half the year (46%) following an AMOC collapse

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