The Sahara Was Green 6,000 Years Ago — Then the Rains Stopped

The Sahara wasn't always a desert. Only a few thousand years ago, enormous lakes, rivers, grasslands and wetlands stretched across North Africa. Hippos, crocodiles, elephants and people lived in places that today are among the driest on Earth. Scientists call this period the African Humid Period — or the Green Sahara. Around 6,000 years ago, the climate began to change. Northern Hemisphere summer sunlight weakened, the African monsoon retreated south, rainfall declined and the vast green landscapes of the Sahara began disappearing. In this episode of Deep Time Files, we follow the evidence preserved in ancient lake beds, sediments, fossils and prehistoric rock art to reconstruct this vanished world — and discover how one of Earth's greenest regions became the world's largest hot desert. Deep Time Files explores Earth's lost worlds, extinct giants, fossil mysteries and the events that reshaped life on our planet. Earth's Lost Worlds. Reconstructed. VISUAL NOTE Some scenes in this documentary use stock footage and AI-assisted scientific reconstructions to illustrate ancient environments and geological processes. SOURCES deMenocal & Tierney — Green Sahara: African Humid Periods Paced by Earth's Orbital Changes, Nature Education Knowledge (2012) Shanahan et al. — The time-transgressive termination of the African Humid Period, Nature Geoscience (2015) Armitage et al. — West African monsoon dynamics inferred from abrupt fluctuations of Lake Mega-Chad, PNAS (2015) Schuster et al. — Holocene Lake Mega-Chad palaeoshorelines from space, Quaternary Science Reviews (2005) #Sahara #AncientEarth #Prehistory