Surveying Archaeologists Across the Globe Reveals Deeper and More Widespread Roots of the Human Age, the Anthropocene
Examples of how human societies are changing the planet abound — from building roads and houses, clearing forests for agriculture and digging train tunnels, to shrinking the ozone layer, driving species extinct, changing the climate and acidifying the oceans. Human impacts are everywhere. Our societies have changed Earth so much that it's impossible to reverse many of these effects.
Some researchers believe these changes are so big that they mark the beginning of a new "human age" of Earth history, the Anthropocene epoch. A committee of geologists has now proposed to mark the start of the Anthropocene in the mid-20th century, based on a striking indicator: the widely scattered radioactive dust from nuclear bomb tests in the early 1950s.
Nuclear bomb testing left its mark in the geologic record.
National Nuclear Security Administration / Wikimedia Commons, CC BY
But this is not the final word.
Not everyone is sure that today's industrialized, globalized societies will be around long enough to define a new geological epoch. Perhaps we are just a flash in the pan — an event — rather than a long, enduring epoch.
Others debate the utility of picking a single thin line in Earth's geological record to mark the start of human impacts in the geological record. Maybe the Anthropocene began at different times in different parts of the world. For example, the first instances of agriculture emerged at different places at different times, and resulted in huge impacts on the environment, through land clearing, habitat losses, extinctions, erosion and carbon emissions, forever changing the global climate.
Human practices like burning the landscape – as in this night bush fire outside Kabwe, Zambia – have been affecting the earth since long before the nuclear era.
Andrea Kay, CC BY-SA
If there are multiple beginnings, scientists need to answer more complicated questions — like when did agriculture begin to transform landscapes in different parts of the world? This is a tough question because archaeologists tend to focus their research on a limited number of sites and regions and to prioritize locations where agriculture is believed to have appeared earliest. To date, it has proved nearly impossible for archaeologists to put together a global picture of land use changes throughout time.
Global Answers From Local Experts
To tackle these questions, we pulled together a research collaboration among archaeologists, anthropologists and geographers to survey archaeological knowledge on land use across the planet.
We asked over 1,300 archaeologists from around the world to contribute their knowledge on how ancient people used the land in 146 regions spanning all continents except Antarctica from 10,000 years ago right up to 1850. More than 250 responded, representing the largest expert archaeology crowdsourcing project ever undertaken, though some prior projects have worked with amateur contributions.
Our work has now mapped the current state of archaeological knowledge on land use across the planet, including parts of the world that have rarely been considered in previous studies.
We used a crowdsourcing approach because scholarly publications don't always include the original data needed to allow global comparisons. Even when these data are shared by archaeologists, they use many different formats from one project to another, making it difficult to combine for large-scale analysis. Our goal from the beginning was to make it easy for anyone to check our work and reuse our data — we've put all our research materials online where they can be freely accessed by anyone.
Earlier and More Widespread Human Impacts
Though our study acquired expert archaeological information from across the planet, data were more available in some regions — including Southwest Asia, Europe, northern China, Australia and North America — than in others. This is probably because more archaeologists have worked in these regions than elsewhere, such as parts of Africa, Southeast Asia and South America.
Animation showing the spread of intensive agriculture across the globe over the past 10,000 years, based on ArchaeoGLOBE Project results.
Nicolas Gauthier, 2019, CC-BY-SA
Our archaeologists reported that nearly half (42%) of our regions had some form of agriculture by 6,000 years ago, highlighting the prevalence of agricultural economies across the globe. Moreover, these results indicate that the onset of agriculture was earlier and more widespread than suggested in the most common global reconstruction of land-use history, the History Database of the Global Environment. This is important because climate scientists often use this database of past conditions to estimate future climate change; according to our research it may be underestimating land-use-associated climate effects.
Our survey also revealed that hunting and foraging was generally replaced by pastoralism (raising animals such as cows and sheep for food and other resources) and agriculture in most places, though there were exceptions. In a few areas, reversals occurred and agriculture did not simply replace foraging but merged with it and coexisted side by side for some time.
View of the Kopaic Plain in Boeotia, Greece. People first partially drained the area 3,300 years ago to claim land for agriculture and it's still farmed today.
Lucas Stephens, CC BY-SA
The Deep Roots of the Anthropocene
Global archaeological data show that human transformation of environments began at different times in different regions and accelerated with the emergence of agriculture. Nevertheless, by 3,000 years ago, most of the planet was already transformed by hunter-gatherers, farmers and pastoralists.
To guide this planet toward a better future, we need to understand how we got here. The message from archaeology is clear. It took thousands of years for the pristine planet of long ago to become the human planet of today.
And there is no way to fully understand this human planet without building on the expertise of archaeologists, anthropologists, sociologists and other human scientists. To build a more robust Earth science in the Anthropocene, the human sciences must play as central a role as the natural sciences do today.
Ben Marwich is an associate professor of archaeology at the University of Washington.
Erie C. Ellis is a professor of geography and environmental systems at the University of Maryland, Baltimore County.
Lucas Stephens is a research affiliate in archaeology at the Max Planck Institute for the Science of Human History.
Nicole Boivin is the director of the department of archaeology at the Max Planck Institute for the Science of Human History.
Ben Marwick receives funding from the Australian Research Council, the Wenner-Gren Foundation and the National Geographic Society.
Erle C. Ellis received funding from the National Science Foundation for this project under grant CNS 1125210. He is a fellow of the Global Land Program, a member of the Anthropocene Working Group of the International Commission on Stratigraphy, and a senior fellow of the Breakthrough Institute. He is a member of the American Association of Geographers.
Lucas Stephens receives funding from the American Council of Learned Societies. He is a Mellon/ACLS Public Fellow and Senior Research Analyst at the Environmental Law and Policy Center and a Research Affiliate at the Max Planck Institute for the Science of Human History.
Nicole Boivin receives funding from the Max Planck Society. She is Director at the Max Planck Institute for the Science of Human History, an Honorary Professor at the University of Queensland, and a Research Affiliate at the Smithsonian Institution and University of Calgary.
Reposted with permission from our media associate The Conversation.
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When they founded their recycling start-up Plaxtil in 2017, it was textile waste they set their sights on. The project developed a process that turned fabrics into a new recyclable material they describe as "ecological plastic."
Mounting Piles of Waste<p>It is not only the streets of Chatellerault where pandemic pollution is piling-up, but also the world's beaches and oceans. Once there, they can take up to 450 years to degrade and disappear.</p><p>Esther Röling, co-organizer of the annual Adventure Clean Up Challenge held on Hong Kong Island, has seen this waste firsthand. In October the sports challenge pitted teams against one another in a competition to remove trash from 13 hard-to-reach coastal areas around the city.</p><p>They find tons of both disposable and reusable masks, said Röling. "You wonder how it ended up there. Was it just thrown on the ground? Or was it in a garbage bag that broke open?"</p><p>Almost 10,000 kilometers away in Antibes on the sunny French Riviera, it's a similar picture. For the past few months, divers and clean-up volunteers working with an ocean clean-up non-profit called Operation Mer Propre have been collecting an increasing number of masks found on land and in the sea.</p><p>"Since the beginning of the lockdown when we started to count, we've reached 800, 900, [and now in total] 1000 masks," said co-founder Joko Peltier. </p><p>According to <a href="https://unctad.org/news/growing-plastic-pollution-wake-covid-19-how-trade-policy-can-help" target="_blank">UN estimates</a>, up to 75% of all coronavirus-related plastic could end up as waste in oceans and landfills.</p>
The Limits of Recycling<p>Yet not all are convinced the recycling of this waste is possible on a global scale. </p><p>"What those citizen groups are doing is really beneficial but once they collect it, it should just go to a landfill or an incinerator. They shouldn't necessarily expect it to get recycled," said Jonathan Krones, an industrial ecologist and visiting assistant professor of environmental studies at Boston College.</p><p>That's because mask recycling programs like Plaxtil are few and far between and most don't have the benefit of a readily adaptable production process. </p><p>Even in countries with solid recycling infrastructure, he says, the system is designed to separate out specific types of waste like bottles or cardboard.</p><p>"I imagine that it would be technically feasible to develop a separation process to filter out masks, but there simply aren't enough of them to make that economical," he said.</p><p>Collection is a big hurdle, he adds. Since each mask only weighs a fraction of a gram and they're scattered on roads or mixed with other trash, it is difficult and costly. </p><p>"You need a lot of raw material of the right quality to make investing in the recycling technology and the recycling system worthwhile," he said.<span></span><br></p>
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