The research team delved into carbonate sedimentary rocks from the Luodian Basin in Guizhou, dating back to 310 to 290 million years ago. Their objective was to investigate the impact of global warming on the oceans during the highly oxygenated environment of the Late Paleozoic Ice Age. The findings reveal that despite the prevalent high levels of atmospheric and oceanic oxidation during this period, sporadic large-scale carbon emissions still triggered climate warming and a decline in seafloor oxygen levels. This expansion of anoxic zones in the global ocean ranged from 4% to 12%, leading to a reduction in marine biodiversity. This study serves as a pivotal reference for understanding the feedback mechanisms within the Earth's climate system, shedding light on potential changes in the ocean environment that could result from global warming under present icehouse climates and highly oxidized conditions.