Holocene climatic optimum
E87433
The Holocene climatic optimum was a warm period roughly 9,000–5,000 years ago when global temperatures, especially in the Northern Hemisphere, were higher than today, influencing the spread of forests and early human civilizations.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Holocene climatic optimum canonical | 4 |
| Holocene Thermal Maximum | 1 |
| Holocene climate variability | 1 |
| Holocene climatic optimum warm period | 1 |
| Middle Holocene | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T742183 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Holocene climatic optimum Context triple: [Holocene, containsEvent, Holocene climatic optimum]
-
A.
Holocene
The Holocene is the current geological epoch, beginning around 11,700 years ago, characterized by relatively stable climate conditions and the development of human civilizations.
-
B.
Pleistocene epoch
The Pleistocene epoch was a geological time period characterized by repeated ice ages, widespread glaciation, and the evolution and global spread of modern humans.
-
C.
Quaternary period
The Quaternary period is the most recent division of geologic time, characterized by repeated ice ages, the evolution and global spread of modern humans, and significant climatic fluctuations over the last 2.6 million years.
-
D.
Pliocene epoch
The Pliocene epoch was a geological time period roughly 5.3 to 2.6 million years ago marked by cooler global climates, the expansion of grasslands, and significant evolutionary developments among mammals and early hominins.
-
E.
Eocene–Oligocene climate transition
The Eocene–Oligocene climate transition was a major global cooling event around 34 million years ago that marked the shift from a greenhouse to an icehouse Earth, including the formation of large Antarctic ice sheets.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Holocene climatic optimum Target entity description: The Holocene climatic optimum was a warm period roughly 9,000–5,000 years ago when global temperatures, especially in the Northern Hemisphere, were higher than today, influencing the spread of forests and early human civilizations.
-
A.
Holocene
The Holocene is the current geological epoch, beginning around 11,700 years ago, characterized by relatively stable climate conditions and the development of human civilizations.
-
B.
Pleistocene epoch
The Pleistocene epoch was a geological time period characterized by repeated ice ages, widespread glaciation, and the evolution and global spread of modern humans.
-
C.
Quaternary period
The Quaternary period is the most recent division of geologic time, characterized by repeated ice ages, the evolution and global spread of modern humans, and significant climatic fluctuations over the last 2.6 million years.
-
D.
Pliocene epoch
The Pliocene epoch was a geological time period roughly 5.3 to 2.6 million years ago marked by cooler global climates, the expansion of grasslands, and significant evolutionary developments among mammals and early hominins.
-
E.
Eocene–Oligocene climate transition
The Eocene–Oligocene climate transition was a major global cooling event around 34 million years ago that marked the shift from a greenhouse to an icehouse Earth, including the formation of large Antarctic ice sheets.
- F. None of above. chosen
Statements (58)
| Predicate | Object |
|---|---|
| instanceOf |
Holocene warm period
ⓘ
climatic period ⓘ paleoclimatic event ⓘ |
| alsoKnownAs |
Holocene climatic optimum
ⓘ
surface form:
Holocene Thermal Maximum
Holocene climatic optimum ⓘ
surface form:
Holocene climatic optimum warm period
|
| climateCharacteristic |
enhanced seasonality in some regions
ⓘ
expansion of lakes in North Africa ⓘ greener Sahara compared to today ⓘ higher summer temperatures in high northern latitudes ⓘ reduced Arctic sea ice in summer compared to early Holocene ⓘ stronger African monsoon in parts of the Sahara and Sahel ⓘ warmer North Atlantic sea-surface temperatures in summer ⓘ warmer conditions in many continental interiors ⓘ |
| duration | several thousand years ⓘ |
| endTime |
circa 5000 years before present
ⓘ
mid-Holocene ⓘ |
| evidenceFrom |
glacial geomorphology
ⓘ
ice cores ⓘ lake sediment cores ⓘ marine sediment cores ⓘ pollen records ⓘ speleothems ⓘ tree rings ⓘ |
| fieldOfStudy |
Earth system science
ⓘ
surface form:
Earth science
Cenozoic glaciations ⓘ
surface form:
Quaternary science
climate science ⓘ |
| follows |
Last Glacial Maximum
ⓘ
surface form:
Last Glacial Period
Younger Dryas cold event ⓘ
surface form:
Younger Dryas
|
| geographicScope |
especially strong in Northern Hemisphere high latitudes
ⓘ
global ⓘ pronounced in Arctic regions ⓘ pronounced in mid- to high-latitude continents ⓘ |
| hasCause |
Milankovitch cycles
ⓘ
high axial tilt of Earth ⓘ increased summer insolation in the Northern Hemisphere ⓘ orbital forcing ⓘ |
| hasEffect |
changes in precipitation patterns
ⓘ
development of extensive wetlands in some mid-latitude regions ⓘ expansion of boreal forests into Arctic regions ⓘ higher sea levels than early Holocene ⓘ increased monsoon intensity in some regions ⓘ northward shift of tree line ⓘ poleward expansion of forests ⓘ reduced extent of some ice sheets and glaciers ⓘ warmer Northern Hemisphere summers ⓘ warmer global temperatures than late 20th century in many regions ⓘ |
| influenced |
Neolithic human civilizations
ⓘ
early agricultural societies ⓘ expansion of human populations in mid-latitudes ⓘ spread of farming in Eurasia ⓘ |
| partOf |
Holocene
ⓘ
surface form:
Holocene epoch
|
| precedes |
Cenozoic glaciations
ⓘ
surface form:
Neoglaciation
|
| startTime |
circa 9000 years before present
ⓘ
early Holocene ⓘ |
| studiedBy | paleoclimatology ⓘ |
| temperatureRelativeTo |
comparable to or lower than early 21st century global mean temperature
ⓘ
higher than preindustrial in many high-latitude regions ⓘ |
| temporalLocation |
Holocene
ⓘ
surface form:
Holocene epoch
|
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Holocene climatic optimum Description of subject: The Holocene climatic optimum was a warm period roughly 9,000–5,000 years ago when global temperatures, especially in the Northern Hemisphere, were higher than today, influencing the spread of forests and early human civilizations.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Middle Holocene
this entity surface form:
Holocene Thermal Maximum
this entity surface form:
Holocene climatic optimum warm period
this entity surface form:
Holocene climate variability