**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 **.

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