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1000 years ago

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Invention of machines






Astrology-astronomy leads the sciences as Arabic and Chinese innovations in celestial navigation and map-making lead explorers across deserts and out into open ocean.  Islamic scholars revive ancient knowledge of mechanics and machines powered by water, rather than muscles.  In 850 the Persian Banu Musa brothers publish the Book of Ingenious Devices that details 100 inventions, including a water-driven system that fills and drains two vats in alternation, making a kind of engine that pumps air to play a flute in the hands of an automaton. (more)

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Forests, population, and land under cultivation

1000 yrs ago map 2020.jpg
1000 yrs ago map
Adapted from HYDE Historic Database of the Global Environment Land use map

Intact Forest

Cultivated land

= 1 million people


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1000 yrs ago graph

Global Population
8 billion in 2023 

CO2 concentration
418 parts per million
in 2023

Average Temperature
15° C in 2023

Sea Level above level in 1900
24 cm in 2023

280 ppm




275 million


Sea level near datum

Medieval Warm Period c.950 - 1250

Black Death 1347-51

Little Ice Age 1300-1870


Disease depopulates the Americas

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Back to 10,000 years ago
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A millennium separates the philosophers of ancient Greece and Rome from the Islamic inventors who interpret their texts and spark mechanical innovations of all kinds.  Their machines are entertainments for the king’s court, only much later adapted for practical use.    For millennia, wood and animal oils are the only fuels.   Forests have been regulated since ancient times with rules on cutting and hunting as strict as the feudal lords were strong.  Large scale destruction or regrowth of forests has been correlated with the decline or success of empires.


At the scale of thousands of years, histories rely on archaeology to complement written records.  Intimate details of individual sites and bones offer a window onto the rise and fall of civilizations, particularly when climate data is added to the narrative.  Drought in particular can prove devastating for even large, well-established

societies such as Mayan Mexico about 800-1000 AD and Mediterranean cultures of Egypt, Greece and the Levant about 1250 to 1100 BCE.  A global change in rainfall patterns starting about 2150 BCE affected ancient empires from Egypt to China.  Archaeologists show that ancient cities did not succumb easily to climate stress, rather they learned and adapted, reshaping the land to retain water, and at times leaned on extensive trade networks for food.  In the worst of times, when reservoirs ran dry and famine emptied cites, rigid, centrally-controlled empires could no longer hold power, and smaller societies emerged with innovative agricultural methods and rugged social organizations.  The success of many ancient civilizations lay in increasingly complex practices of conserving water, soil nutrition, and old-growth forests, while farming the same land over thousands of years. 

1000 yrs ago text


Text: Ibn Shakir, A. i. M. (1979). The book of ingenious devices (Kitab al-hiyal). Boston, D. Reidel Publisher.

Finkelstein, I. (2017). "Egyptian Imperial Economy in Canaan: Reaction to the Climate Crisis at the End of the Late Bronze Age." Agypten und Levante 27: 249-259. 

David L. Lentz, N. P. D., Vernon L. Scarborough, Liwy Grazioso (2018). "Imperial resource management at the ancient Maya city of Tikal: A resilience model of systainability and collapse." Journal of Anthropological Archaeology 52: 113-122.

Middleton, G. D. (2018). "Bang or whimper? The evidence for collapse of human civilizations at the start of the recently defined Meghalayan Age is equivocal." Science 361(6408): 1204-1205.

Image: Composite of images: Flautist from  Kitāb Arshimīdas fī al-binkāmāt كتاب أرشميدس في البنكامات Archimedes أرشميدس British Library Add MS 23391, ff 2r-21r.    Diagram of flute machine constructed by Camila Lohzic based on Ibn Shakir, The book of ingenious devices

Map: Williams, M. (2006). Deforesting the earth: from prehistory to global crisis. Chicago, Chicago University Press.

Benjamin David Stocker, Zicheng Yu, Charly Massa and F. Joos (2017). "Holocene peatland and ice-core data constraints on the timing and magnitude of CO2 emissions from past land use." Proceedings of the National Academy of Sciences(201613889).

PBL Netherlands Environmental Assessment Agency. (2000). "HYDE: History Database of the Global Environment."   Retrieved 22 September 2018, 2018, from

Population Education. (2015, 26 March 2015). "World Population."   Retrieved 21 September 2018, 2018, from

CO2: Etheridge, D. M., L. P. Steele, R. L. Langenfelds, R. J. Francey, J.-M. Barnola, V. I. Morgan. (1996. ). "Natural and anthropogenic changes in atmospheric CO2 over the last 1000 years from air in Antarctic ice and firn." Journal of Geophysical Research 101( D2 ): 4115-4128.

British Antarctic Survey (2014) "Ice cores and climate change." British Antarctic Survey.

Etheridge, D. M., L. P. Steele, R. L. Langenfelds, R. J. Francey, J.-M. Barnola, V. I. Morgan. (1996. )

Temperature: NOAA National Centers for Environmental Information. (2016). "Climate Model Simulations of the Last 1,000 Years."   Retrieved 20 September, 2018, from

Sea Level: Robert E. Kopp, A. C. K., et al. (2016). "Temperature-driven global sea-level variability

in the Common Era." Proc Natl Acad Sci USA 113(11): E1434 - E1441.

Population: Wikipedia. (2018). "World Population Estimates."   Retrieved 20 September, 2018, from

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