Has Earth always been what it is like now? engineering
Early in Earth's history, oxygen producers and consumers on the planet maintained equilibrium in a way that left little oxygen in the atmosphere. However, there were two events in the period, which saw oxygen levels go from low levels to much higher levels that the Earth has today.
According to Fournier and his team, organic carbon, whose breakdown consumes oxygen in usual circumstances, was likely unavailable to its consumers during these intervals that led to oxygen build-ups. Since, the researchers looked at marine microbes and minerals in ocean sediments to determine if such as situation could arise.
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