Core Insights - An international research team led by researcher Chen Jitao from the Nanjing Institute of Geology and Palaeontology has published findings on the impact of global warming under high oxygen environments on oceans in the journal Proceedings of the National Academy of Sciences (PNAS) [1] Group 1: Research Context - The late Paleozoic glaciation period, lasting from 360 to 260 million years ago, is noted as the longest icehouse climate period since the establishment of terrestrial higher plants and ecosystems [4] - During this period, atmospheric oxygen levels peaked at approximately 1.2 to 1.7 times the current levels, potentially linked to the gigantism of marine and terrestrial animals and triggering significant marine biodiversity events [4] Group 2: Research Findings - The research team studied carbonate rock sediment sequences from 310 to 290 million years ago in the Guizhou Luodian Basin, exploring global carbon cycles and marine redox states during this period [5] - The findings indicate that increased organic carbon burial in the ocean may have led to a decrease in atmospheric CO2 and an increase in oxygen levels, despite high overall oxidation levels [5] - Intermittent massive carbon emissions during this time could cause repeated climate warming and hypoxia in the oceans, expanding the area of oceanic hypoxia to between 4% and 12%, potentially leading to stagnation or decline in marine biodiversity [5] Group 3: Implications - The study suggests that under current icehouse climates and high oxidation states, global warming may lead to widespread oceanic hypoxia, providing valuable insights into the interconnections and feedback mechanisms within the Earth's climate system [7]