Long time ago, Sahara was a city of greens, water and healthy ecosystem for different wild lives. There were rivers filled different fishes and birds of their kinds in the air. Hippos and giraffe lived there, and large human populations of fishers searched for food by the riverside. The “Green Sahara” was a time between 11,000 and 4,000 years ago when significantly more rain fell across the northern two-thirds of Africa than it does today.
This outlived green Sahara was highly diverse and included species commonly found on the margins of today’s rainforests along with desert-adapted plants. The arid vast sand one sees today supported lives and there
These conditions stand in marked contrast to the current climate of northern Africa. Today, the Sahara is the hottest desert in the world. It lies in the subtropical latitudes dominated by high-pressure ridges, where the atmospheric pressure at the Earth’s surface is greater than the surrounding environment. These ridges inhibit the flow of moist air inland.
How the Sahara became a desert?
The stark difference between 10,000 years ago and now largely exists due to changing orbital conditions of the earth – the wobble of the earth on its axis and within its orbit relative to the sun.
But this period ended erratically. In some areas of northern Africa like Morocco and Libya that border the Sahara, the transition from wet to dry conditions occurred slowly; in others it seems to have happened abruptly. This pattern does not conform to expectations of changing orbital conditions, since such changes are slow and linear.
Could it mean that Southern part of Africa would experience this transition thousands of years to come?