1739 BC – year when the Sumerian civilization collapsed

Sumerians are known as the founders of the urban civilization that dominated in southern Mesopotamia in the 4th and 3rd millennia BC. They developed a network of irrigation channels that made it possible to cultivate cereals in desert areas of the Lower Euphrates, introduced an ideographic script, initially pictographic and then simplified to the form of cuneiform characters impressed in wet clay, built the biggest cities in the world at that time, with monumental temples and enormous palaces.

Najważniejsze miasta południowej Mezopotamii pod koniec III tysiąclecia p.n.e. Sumer rozciąga się od Eridu do Nippur, obszar między Kisz a Sippar był zamieszkany przez Akadów, a w II tysiącleciu stanowił trzon państwa babilońskiego. Na mapie został zaznaczony przybliżony zasięg Zatoki Perskiej na przełomie III i II tysiąclecia Near_East_topographic_map-blank.svg: Sémhur (na podstawie licencji CC BY-SA 3.0, via Wikimedia Commons)
The most important cities of Mesopotamia in the late 3rd millennium BC. Sumer stretches from Erid to Nippur, the region between Kish and Sippar was occupied by Akkadians, then in the 2nd millennium it was the core of the Babylonian state. The map shows the range of the Persian Gulf in the late 3rd and early 2nd millennium BC
Near_East_topographic_map-blank.svg: Sémhur(published under CC BY-SA 3.0, via Wikimedia Commons)

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Climate Change and State Evolution

Despite substantial evidence on the short-term effects of adverse climate shocks, our understanding of their long-term impact is limited.  To address such a key issue, research has focused on ancient societies because of their limited economic complexity and their unparalleled experience of environmental and institutional change.  Notably, ‘Collapse Archaeology’ literature has reported statistical evidence consistent with the mantra that severe droughts trigger institutional crises.  This view, however, has recently been challenged by literature summarized in the paper Climate Change and State Evolution by Giacomo Benati and Carmine Guerriero.

Ziggurat w Nippur (współczesny Nuffar, Irak), niegdyś centrum religijne południowej Mezopotamii. Nawet jeśli uznajemy wywołany przez przemiany środowiska upadek starożytnych społeczeństw, to aby właściwie ocenić pełny wpływ zmian klimatycznych i związanych z nimi zmian politycznych, musimy odpowiednio połączyć wyniki analiz nauk przyrodniczych i społecznych © G. Benati
Ziggurat of Nippur (modern Nuffar, Iraq), once at the center of a key religious Mesopotamian polity and cultic center. Even if the environmental induced collapse of ancient societies has attracted much attention, to correctly evaluate the full impact of climate change and inform policy intervention we need to properly combine natural and social sciences. 
©  G. Benati

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