The pace of climate change matters more than overall heat in the race to save key Atlantic currents, study finds

Atlantic Ocean currents that regulate the global climate can adapt to rising temperatures, but the sheer pace of warming may cause the catastrophic collapse of these currents in the next few decades, a new study suggests.

Climate models show that when global temperatures rise slowly due to small year-over-year increases in atmospheric carbon dioxide (CO₂), evaporation and sea ice feedbacks maintain Atlantic currents' strength at temperatures exceeding 9 degrees Fahrenheit (5 degrees Celsius) of warming above preindustrial levels. By contrast, a rapid rise in global temperatures driven by yearly greenhouse gas emissions equal to or higher than today's may trigger a tipping point at just 3.6 F (2 C) of warming, researchers found.