US EditionHow Oxygen Enriched the Earth’s Atmosphere 2.5 Billion Years Ago
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Cyanobacteria, as they still exist today, were the first organisms to carry out photosynthesis and release oxygen. Produced in the primitive oceans about 2.5 billion years ago, this oxygen has accumulated in the Earth's atmosphere on an immense scale. A research team led by Professor Andreas Kappler, geomicrobiologist [...]
How oxygen enriched the Earth’s atmosphere 2.5 billion years ago
26.02.2026 - Cyanobacteria as they still exist today were the first organisms to carry out photosynthesis and release oxygen. Produced in primeval oceans around 2.5 billion years ago, this oxygen accumulated in the Earth's atmosphere on an immense scale.
The cyanobacteria that exist today were the first organisms to photosynthesize in the early oceans around 2.5 billion years ago, releasing oxygen in the process. This oxygen accumulated in the Earth's atmosphere to an immense extent. A research team led by Professor Andreas Kappler from the Geomicrobiology Department at the University of Tübingen investigated how this was possible, despite the fact that the abundant iron dissolved in ocean water…
The Earth was devoid of atmospheric oxygen two billion years ago. Indeed, free oxygen, as we breathe it today, only appeared in a sustainable way at a time...
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