Special
The Rise of Oxygen
Earth's early atmosphere is thought to have contained only small amounts of oxygen, not enough to sustain life as we know it today. The events that changed an atmosphere essentially deprived of oxygen to one that contains about 21 percent remain hotly debated. Nature presents a Review article that discusses our latest understanding of the evolution of Earth's oxygen levels together with a selection of related content that Nature has published during the past ten years.
Credit: Ariel D. Anbar