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2.Less than one percent of the species of plants in the tropical rainforests actually have been analyzed to determine their value in the world of medicine.

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2. In the second half of the 20th century, the Sahel was increasingly afflicted by soil erosion and desertification  resulting from growing human populations that made more demands upon the land than previously.

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2. The highest peak in the Sahara is the volcano Emi Koussi (11,204 feet) in the Tibesti Mountains.

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1. It forms a transitional zone between the arid Sahara to the north and the belt of humid savannas to the south.

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1.There were around 6 million  square miles of rainforest in the beginning, but now because of deforestation, there are really only less than half of that still found in the world.

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1. Half of the Sahara receives less than an inch of rain per year, and the rest receives up to 4 inches per year.