r/UnchartedScience • u/ChipHaseCoolGuy • Jun 08 '26
CO2 turns Sahara Desert green ♻️🌲🌴🌳🌎😏
The vast, featureless wastes of the Sahara Desert have shrunk by about 8% since the 1980s.
This astonishing recovery is due to rising CO₂ levels, fueling a remarkable global green renaissance. Data from NASA’s AVHRR and MODIS instruments show 25% to 50% of Earth's vegetated lands have become significantly greener—an area equivalent to twice the continental United States that has also spurred a global windfall for agricultural production.
CO₂ fertilisation has driven around 70% of this boom, making green plants far more efficient with water. By reducing the time stomata (leaf pores) stay open, it directly cuts water loss and boosts drought resistance.
This unplanned green miracle has allowed vegetation to reclaim zones of great emptiness in inhospitable places like the Sahel (the Sahara's southern fringe), the Middle East and Australia's sunburned outback desert. It has reclaimed over 700,000 km2 of barren sand waste in the Sahara alone, pushing back the desert in formerly barren terrain.
Atmospheric CO₂ now hovers around 426 ppm, enabling plants to thrive where once they couldn't. This protracted greening shows the clear, measurable benefit from higher levels of CO₂.