What Triggers the Oxygen Decline?
Several natural processes drive this shift. First, the Sun will continue to grow brighter over time. As it does, solar radiation will speed up chemical reactions in the atmosphere. This extra energy causes Earth’s surface to heat up, which in turn affects carbon dioxide levels.
At the same time, the carbonate-silicate cycle, which regulates atmospheric CO₂, will slow down. As CO₂ levels drop, plants will no longer be able to perform photosynthesis. Without photosynthesis, oxygen production comes to a halt. As a result, Earth’s oxygen supply begins to disappear, leaving behind a methane-heavy atmosphere.
Researchers believe this deoxygenation will likely occur before Earth reaches a “moist greenhouse” state, a phase where water from the oceans starts evaporating into the atmosphere and escapes into space.
It’s important to note that the planet’s surface conditions will grow increasingly hostile long before oxygen disappears entirely. Rising temperatures, weakened ozone protection, and atmospheric shifts will push ecosystems to the brink long before the final collapse.
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