From the atmosphere to the deepest ocean depths, our planet is highly oxygenated. But it wasn't always this way, and scientists wonder how much longer the current situation will last, with enough oxygen to sustain all species on Earth. This still poorly understood issue not only has enormous implications for the future of the Earth's biosphere, but also for the search for life on planets similar to ours, beyond the Solar System.
In a new study published in Nature Geoscience, Kazumi Ozaki of Toho University in Japan and Christopher T. Reinhard of the NASA Center for Astrobiology and the Atlanta Institute of Technology have addressed the question using a new… See more