Archaeology and the Anthropocene: Island Laboratories and Case Studies
The Anthropocene and Archaeology
This book uses the Anthropocene as a lens to study how humans have changed the Earth and how archaeology helps us understand those changes across time and space.
Rapa Nui (the Hollywood movie) is used as a prompt to ask what living peoples can do to shape their future, but the book emphasizes a nuanced view of how environment, technology, and social organization interact to create outcomes.
Core idea: humans are a geological force shaping the planet, a claim attributed to the Anthropocene, defined from the Greek Anthropos (human) and cene (geological age).
Crutzen and the Anthropocene: the nineteenth century Industrial Revolution accelerated fossil fuel use, emissions of CO2 and methane, and the embedding of human activity in global geochemical cycles.
Debates persist about when the Anthropocene began and what counts as its precise markers; different dates highlight different kinds of evidence (geochemical, biological, technological, social).
Archaeology offers a long-term perspective on human interactions with environments, showing how past choices produced enduring environmental legacies and how people responded to rapid ecological transformation.
Archaeology is framed as the central toolkit for tracing the processes that shaped past societies and their environments, and for yielding insights relevant to today’s problems.
The Anthropocene provides a conceptual basis for a comparative, world-wide narrative that challenges linear histories of hunter-gatherers to farmers to states, emphasizing cumulative engagements with varied environments.
The book uses a global, island-focused approach to illustrate how different societies constructed niches, modified landscapes, and faced ecological limits.
Key concepts introduced:- The Anthropocene: definitions, origins, and markers
The role of archaeology in understanding past and future in the Anthropocene
Prehistory as a reflection of cultural diversity across the world
Major archaeology methods: survey and excavation
Next theme to explore: What is the Anthropocene?
What is the Anthropocene?
Human history spans two major geological epochs: the Pleistocene and the Holocene.
Pleistocene began about years ago and ended as modern humans and their societies evolved toward the end of this epoch, around years ago.
Pleistocene climate: on average 9-18^{\text{
{0}}C cooler than today, with glacial and interglacial cycles; glacial periods had large ice sheets; interglacials saw sea levels rise.
Megafauna: large-bodied animals that thrived yet faced extinctions as climates shifted and humans expanded.
Holocene began about years ago, characterized by retreating glaciers and more stable, warm conditions; human expansion across the globe, farming, cities, and civilizations.
Paul Crutzen, in his Nobel Prize address (2002), popularized the term Anthropocene to denote a new geological age dominated by human influence on the Earth’s system.
Crutzen highlighted the Industrial Revolution as a turning point with high fossil fuel use and emissions leading to global environmental impacts, though debates continue about start date and markers.
Markers and markers debates:- Ice cores, geochemical residues such as ice bubbles, calcium carbonates, and rising greenhouse gas levels in the last few hundred years; these tracks may indicate onset.
Species die-offs and mass extinctions that may leave a long-lasting footprint in the geological record.
The Industrial Revolution as a key marker for many scholars, but alternative early markers have been proposed (coal-fueled ironworking in Song Dynasty China; African iron smelting in the thirteenth century).
Geologist Jan Zalasiewicz proposes a date for the onset at June 16, 1945, the first atomic bomb detonation, due to the distinctive isotopic signatures produced: Cesium-137 and Plutonium-239/240, which persist in the environment for thousands of years.
Microplastics are a modern marker that may represent the latest geological signature of our age.
The Anthropocene debate matters because recognizing a longer historical horizon links modern problems to longer-term human-environment interactions and avoids placing blame solely on modern technology.
Methane is highlighted as a significant climate actor, with domesticated cattle as a major historical contributor as their numbers grew since roughly years ago.
The idea of human niche construction: humans altering their environment to improve survival and descendant fitness, a process that began long before the last few centuries; evidence includes forest clearance, plant and animal domestication, and urban development beginning deep in prehistory.
The climate-human story is not linear; multiple pathways and outcomes existed in different places, shaped by local environments and social choices.
The concept of “islands as laboratories” is used to illustrate how isolated environments reveal diverse human adaptations and niche constructions.
The Perspective of Archaeology
Archaeology provides a long-term, global view of human-environment interaction and demonstrates that there is no single universal outcome or fix-all solution.
Studying past decisions across varied locales shows how new niches were created and adapted in response to environmental pressures.
The past teaches that human ingenuity can yield successful outcomes if diverse solutions are integrated with the dynamic natural world.
This chapter uses Rapa Nui and Greenland as contrasting case studies to illustrate how different cultural responses produced very different outcomes under environmental pressure.
Polynesia and the North Atlantic Islands as Laboratories
The South Pacific Islands are a key setting for island laboratory studies, where the first voyagers settled many islands around West Polynesia by about 800 BCE, but East Polynesia including Rapa Nui remained undiscovered for about 1,600 more years.
The Moana narrative in popular culture echoes a real archaeological mystery: voyaging and settlement patterns reveal why certain islands were settled while others remained beyond reach for centuries.
Archaeological surveys and excavations on Manuʻa (eastern Samoa) identified the To'aga site, showing occupation since about ; eleven stratigraphic layers were documented, with deeper layers containing pottery and marine shell remnants, indicating a long history of human activity.
The survey demonstrated methods for tracing past human activity, including how artifacts and features map onto landscape use (gardening, fishing, habitation).
The island laboratories approach shows how islands serve as microcosms for human activity, illustrating diverse outcomes in island societies.
The South Pacific narrative outlines that colonization produced patterns common to many islands: extinction of ground-nesting birds and palms, enrichment of agricultural land, and expansion of human populations across environmental zones.
Variation exists: Tikopia experienced egalitarianism and abundant breadfruit; Hawaiʻi showed rigid chiefdoms and social hierarchy; instances of cannibalism occurred in Fiji; some islands remained relatively egalitarian while others developed stratified societies.
Some island societies failed or were abandoned (Pitcairn Island); there is no single inevitable outcome.
The islands-as-laboratories framework sets the stage for comparing Rapa Nui with Greenland to understand diverse cultural responses to environmental change.
Rapa Nui
Colonization around by peoples whose ancestors had moved from the Cook Islands, Society Islands, and Austral Islands, located ~$1{,}243$ miles ($\approx 2{,}000$ km) to the west.
Soils on Rapa Nui were poor and crop yields were unreliable due to unpredictable rainfall; imported yams, taro, and bananas persisted only with difficulty, with sweet potato arriving around as the main staple.
Rats and chickens provided protein and survived on native vegetation such as palms.
The dramatic stone moai, carved from a quarry on the crater side, were transported to the coast and erected atop ahu platforms facing inland; eyes carved from coral completed the statues.
Moai construction appears by around , and nearly 300 moai and associated ahu were routinely rebuilt and enhanced.
The largest land animal on the island was the domesticated dog; no wheeled carts or animal labor were used to move the moai.
Transportation theory: a system of ropes might rock statues from side to side along prepared roads from quarry to coast.
Life on the island faced limited hardwood for boats, droughts, and poor soils; gardens were rock-mulched to retain moisture; Pacific rats consumed palm seeds, preventing palm palm regeneration and contributing to palm extinction.
The palm loss and degraded soils led to dispersed settlement patterns; communities gathered for social events centered on the ahu and moai, fostering social integration through shared ritual and labor.
Later, moai were toppled in conflicts, possibly to sever ties with ancestors and land; however, evidence for large-scale warfare or fortifications is limited.
The central claim in archaeology is that moai construction was a strategic response to scarcity rather than the sole driver of environmental collapse; the activity redirected energy away from population growth, helping communities survive episodic shortfalls.
The Rapa Nui story shows an adaptive niche construction at scale but with severe environmental cost, including loss of biodiversity, rock-mulch gardens, and palm extinction; it also shows how a small, cohesive society innovated to survive in a constraining environment and preserve heritage for future generations.
Greenland: Norse Settlement and Thule Inuit Interactions
Greenland’s history contrasts with the Pacific Islands: Norse settlers faced a period of climate improvement during the medieval warm period (c. ), enabling colonization from Iceland to Greenland with two main settlements: Western and Eastern (Brattahlid area is part of the Eastern Settlement; these farmsteads persisted for roughly five centuries).
Norse settlers built churches and maintained European-style farmsteads, relying on cattle and pasture during the summer, while hay for winter was stocked and cattle were used for labor; they traded with outside ships for essentials since Greenland lacked timber, metals, glass, and other crafts.
By around , trade links diminished: traders stopped delivering walrus hides and ivory, no new bishop arrived, and resources such as timber, iron, glass, mead, and beer were not restocked.
The Norse gradually shifted to smaller livestock (sheep and goats) as pastures dwindled due to cooling climates; their diets increasingly included seal meat; bones suggest a decline in reliance on dairy products as cattle numbers fell.
The question of when and how Norse Greenlanders left or died out remains debated, with hypotheses including climate cooling, epidemics, cessation of ship traffic, or external threats; evidence points to a rapid abandonment of farmsteads and churches as Greenland’s conditions worsened.
The Thule Inuit (heirs to the Dorset) migrated into Greenland and spread rapidly from 1000 CE eastward across the Arctic; the Thule are associated with advanced sea-based hunting and a mobile lifestyle, using sleds, boats, harpoons, and large-scale marine resources.
The Dorset culture preceded the Thule in some regions; a Dorset mask from 500-1000 CE and other artifacts show a different material culture, emphasizing Arctic animals and ritual imagery.
Norse Greenlanders and Thule Inuit likely interacted, as evidenced by Norse-period artifacts depicting Norse presence in Thule contexts and Norse accounts of conflicts; however, there is little evidence of Norse admixture with Thule populations in modern Greenlanders.
The Thule expansion may have been driven by access to meteoric iron and the abundance of bowhead whales during the medieval warm period; interactions with Norse Greenlanders are evidenced in limited ways yet show distinct cultural trajectories.
The ultimate fate of the Norse in Greenland illustrates how a society reliant on a European farming model can fail to adapt to a cold, resource-scarce environment that lacks necessary inputs and trade networks to sustain a persistent niche.
Lessons Learned
Archaeology reveals that both Rapa Nui and Greenland existed in anthropogenic environments: humans introduced and managed plants and animals, transformed landscapes into fields and pastures, and adapted social organization to ecological constraints.
The two cases demonstrate opposite outcomes: Rapa Nui managed to persist as a connected, ritual-centered society despite scarcity, while Norse Greenlanders failed to adopt a sustainable ecological niche and ultimately abandoned or perished.
The concept of ecological niche construction helps explain how humans modify environments to enhance fitness and survival; early forms include forest clearing, domestication, and building urban settlements, with evidence dating back at least years ago worldwide.
Domesticated mammals now make up roughly 90 percent of total mammal biomass, a striking indicator of long-term human-driven ecological change.
Debate over when the Anthropocene began matters: a late onset linked to fossil fuel use may underplay long-standing human modification of environments; a longer view emphasizes cumulative, centuries-to-millennia scales of influence and challenges the idea that only modern technologies drive ecological change.
The Anthropocene could be understood as a history of long-term human-nature interactions rather than a single modern event, and it invites reframing problems as consequences of persistent, multi-generational activity.
The idea that humans have always changed their environments suggests hope and agency: if we recognize our long-term engagement, we can craft sustainable niches for future generations.
The islands-as-laboratories perspective shows that context matters: environments with limited resources force different adaptive strategies and social organizations, shaping long-term outcomes.
Next steps: applying a long-term archaeological lens can help identify multiple possible futures based on diverse cultural strategies rather than a single universal path.
Methods: Survey and Excavation
Archaeology blends two core methods: survey and excavation.
Survey aims to locate archaeological sites and features across landscapes, documenting their extent and form, from a single artifact to entire settlements; surveys in the Pacific Islands reveal distributions of pottery, surface architecture, walls, and platforms.
Excavation records the precise location and context of artifacts, features, and remains buried in the ground to reconstruct past life; maintaining context is crucial because it preserves information about how artifacts relate to one another and to formation processes of the archaeological record.
Context is key: if artifacts remain in their original position, they are in situ; the excavation process seeks to minimize disturbance to preserve the information they convey about site formation processes.
The chapter emphasizes that generating information, not merely finding objects, is the primary goal of excavation; later chapters provide more detail on specific excavation techniques and methodologies.
Modern examples include image maps derived from satellite imagery at Wadi Sana, Yemen, to plan surveys and locate artifacts before digging.
The role of survey and excavation is to build narratives about past decisions, niche construction, and how people manufactured and modified new environments over time.
How Have Humans Made Their World?
In the early 21st century, human history resembles Rapa Nui in terms of integration, exchange, and the flow of resources and ideas across the globe; interconnectedness has accelerated niche construction and the manipulation of landscapes.
The book emphasizes the myriad ways humans have constructed niches and the role of transmission of cultural practices across generations as crucial for human fitness and societal continuity.
Key historical arcs highlighted include:- Stone tools as durable tech enabling hunting and expansion (Chapter 3).
Emergence of metal tools enabling transformation of forests and valleys (Chapters 6 and 7).
Large-scale plant and animal domestication enabling population growth and agricultural intensification (Chapters 3 and 8).
The growth of rural and urban niches around settlements, leading to extensive, managed landscapes and resources exploitation (Chapter 10).
Seven thousand years ago marks a turning point where human-built niches existed around the world, and human activity began to touch natural systems, gradually intensifying over time.
The present-day challenge remains: how do we continue to balance human needs with ecological stability while learning from the diverse regional histories?
Chapter questions to guide study:
1) How does archaeology illuminate the challenges of the Anthropocene?2) How does comparing Polynesian and Greenlandic histories illustrate global cultural diversity?
3) What is the purpose of excavation in archaeology?
Notable Figures, Dates, and Markers (Key References)
Pleistocene: years ago (start) and ended as modern humans emerged around years ago.
Holocene: began about years ago.
The Anthropocene: term popularized by Crutzen; debates about start date and markers continue.
Industrial Revolution: key marker for many; fossil fuel dependence and rising CO2/MCH4 emissions.
Atomic age marker (Zalasiewicz): onset date argued as with isotopes Cesium-137 and Plutonium-239/240 detectable in environmental records.
CO2 levels: during glacial-interglacial cycles ; in recent times, levels exceed with 1992 at and 2019 at > 415 \text{ ppm} at Mauna Loa.
Rate of CO2 increase: current rise is about faster than the transition from the last Ice Age.
Methane contribution: historically driven by domesticated cattle and other agricultural activities; numbers of cattle increased since years ago.
Megafauna decline and extinctions: examples include species declines linked to human expansion and climate shifts; the current sixth extinction is ongoing, affecting many taxa including rhinos, elephants, polar bears, and numerous birds.
Population dynamics: Homo sapiens reached people after about years; global population doubled to within roughly a single century.
Rapa Nui specifics: colonization around ; moai construction by ; palm loss and soil degradation; moai as a social technology to maintain population under scarcity.
To'aga site: occupation since ; beach sand deposit discovered beneath later layers; excavation depth recorded as below surface; ten stratigraphic layers documented; excavation reached depth.
East Polynesian expansion and timing: voyaging and settlement occurred across many islands; the eastern limit of Polynesian contact around with continued exploration for centuries.
Greenland Norse settlement dates: Medieval warm period enabled settlement around ; two major settlements: Western and Eastern; Norse farmsteads sustained for centuries but eventually declined due to climate and resource constraints.
Thule Inuit expansion: by onward; replaced Dorset populations in northern Greenland; mobile hunting strategies and advanced harpoons aided adaptation; Norse did not adopt Thule practices and eventually decoupled from their Greenland settlements.
Island laboratories: presage that islands can reveal divergent cultural trajectories under similar planetary pressures; illustrate the complexity of prehistory and modern anthropogenic change.