When and why was the Sahara green?

✅ Records from ocean sediment show that the Green Sahara happens repeatedly in Earth's history.

✅ Sometime between 11,000 and 5,000 years ago, after the last ice age ended, about 9 mln square kilometers (3.5 mln square miles) of the modern Sahara Desert was a green place with lakes, where animals like elephants, hippos and antelopes feasted on thriving grasses and shrubs.

✅ The Green Sahara, also known as the African Humid Period, was caused by the Earth's constantly changing orbital rotation around its axis, a pattern that repeats itself every 23,000 years, researchers believe.

✅ Right now, the Northern Hemisphere is closest to the sun during the winter months, and during the Green Sahara, the Northern Hemisphere was closest to the sun during the summer. This led to an increase in solar radiation, in other words, heat, heat in summer, and created a low pressure system that ushered moisture from the Atlantic Ocean into the desert.

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