Climate Change
Earlier in an era of prehistory the Sahara region to the south was not an arid desert, but rather in places grasslands grew with seasonal lakes, and corresponding flora and fauna. Prior to 6000 years ago, evidently the vast Sahara region to the south was better watered, more a savanna which could support herds; yet then a desiccation process set in, leaving a more parched desert as it is today.
The wettest time of the Sahara appears the more archaic, which may correspond to a certain glacial period in Europe (the Würm, which ended c. 9000 BC). Subsequently, during neolithic pre-history in North Africa (c. 6000 to 2500) and continuing to modern times, "damp pluvial" phases appear to alternate with "dry inter-pluvial" phases. The general 'post-Würm' climate (the repeated succession of long periods of more rainy weather followed by arid) remains problematic with respect to fixing dates in history, e.g., apparent contradictions may arise simply due to divergent micro-climates.
During its recorded history the physical features and environment of the land now called Tunisia have remained fairly constant; however, there were differences, e.g., the northern forests during ancient times reportedly grew more abundantly, the land being perhaps watered better. A study by Prof. Shaw has criticized a century of scholarly literature which theorizes a long decline in agricultural conditions since ancient times due to destructive invasions and significant climate change; Shaw writes that such theories may be based on "false assumptions about the past, dubious literary evidence, and misunderstood archaeological data." Deforestation since ancient times probably dates to the late 19th and 20th centuries, with its general increase in the "intensity of agricultural exploitation of the countryside." The lack of a modern grain surplus for export may be chiefly due to an increase in local population.
Read more about this topic: History Of Tunisia
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