地理漫步·世界地理英语30篇（3）
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The Sahara: From Green Pastures to Golden Sand
撒哈拉：从青翠牧场到金色沙海
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About 10,000 years ago, the Sahara was covered with grasslands, lakes, and rivers that supported cattle herding and fishing.
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This ‘Green Sahara’ period ended gradually as Earth’s orbital tilt shifted, reducing summer monsoon rains over North Africa.
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Rock art in Algeria’s Tassili n’Ajjer shows giraffes and crocodiles—species that vanished when the desert expanded.
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Today, fossil aquifers beneath the sand hold more water than the Nile River carries in fifty years.
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Solar farms in Morocco and Egypt now tap the region’s abundant sunlight, generating clean energy for growing coastal cities.
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Nomadic Tuareg communities maintain ancient trade routes across dunes, using star navigation and oral geography knowledge.
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Dust storms from the Sahara travel across the Atlantic, fertilizing the Amazon rainforest with phosphorus-rich particles.
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Scientists drill lake sediments in Chad’s Bodélé Depression to reconstruct past climate shifts recorded in mineral layers.