Controlled source register
Read the 36 registered sources
Open the papers, reports, datasets and institutional records used to build this investigation.
Source 01
Climate Change 2022 — Impacts, Adaptation and Vulnerability, Chapter 13: Europe
Intergovernmental Panel on Climate Change · 2022
Use in this investigation: European heat, drought, agriculture, water scarcity, wildfire, regional vulnerability and adaptation limits.
Boundary: Assessment evidence is organised by global warming level and European subregion; it does not project one uniform European future.
https://www.ipcc.ch/report/ar6/wg2/chapter/chapter-13/Source 02
Climate Change 2022 — Cross-Chapter Paper 4: Mediterranean Region
Intergovernmental Panel on Climate Change · 2022
Use in this investigation: Mediterranean hotspot, water scarcity, drought, wildfire, ecosystem change and desertification risk.
Boundary: Mediterranean-wide findings must not be applied unchanged to northern Europe.
https://www.ipcc.ch/report/ar6/wg2/chapter/ccp4/Source 03
Climate Change 2021 — The Physical Science Basis, Chapter 10
Intergovernmental Panel on Climate Change · 2021
Use in this investigation: Mediterranean drought severity, soil moisture, runoff and regional projection confidence.
Boundary: Scenario and warming-level labels must remain attached to numerical projections.
https://www.ipcc.ch/report/ar6/wg1/chapter/chapter-10/Source 04
Climate Change 2021 — The Physical Science Basis, Chapter 12
Intergovernmental Panel on Climate Change · 2021
Use in this investigation: European precipitation, drought, heavy rainfall and fire-weather projections.
Boundary: Drying and heavy-rainfall risk can increase together; annual precipitation alone is not a complete drought measure.
https://www.ipcc.ch/report/ar6/wg1/chapter/chapter-12/Source 05
European Climate Risk Assessment
European Environment Agency · 2024
Use in this investigation: Major European climate risks, urgency, southern-European hotspot and cross-sector consequences.
Boundary: Risk combines hazard, exposure and vulnerability; it is not a climate projection alone.
https://climate-adapt.eea.europa.eu/en/eu-adaptation-policy/key-eu-actions/european-climate-risk-assessment/Source 06
European State of the Climate 2025
Copernicus Climate Change Service / ECMWF and World Meteorological Organization · 2026
Use in this investigation: Latest controlled European observations for temperature, heat stress, snow, glaciers, wildfire, marine heat and river flows.
Boundary: One year is context within a long-term trend, not proof of a permanent regional state transition.
https://climate.copernicus.eu/esotc/2025Source 07
Drought impact on ecosystems in Europe
European Environment Agency
Use in this investigation: Soil-moisture exposure, vegetation-productivity impact and regional ecosystem stress.
Boundary: Indicator impact is measured against a 2000–2020 baseline and must not be described as permanent desert expansion.
https://www.eea.europa.eu/en/analysis/indicators/drought-impact-on-ecosystems-in-europeSource 08
Water scarcity conditions in Europe
European Environment Agency
Use in this investigation: Seasonal water stress, geographic distribution and distinction between climatic scarcity and abstraction pressure.
Boundary: Water scarcity can arise from demand as well as climate; WEI+ is not an aridity index.
https://www.eea.europa.eu/en/analysis/indicators/use-of-freshwater-resources-in-europe-1Source 09
Current drought situation in Europe
European Commission Joint Research Centre — European Drought Observatory · 2026 current monitoring
Use in this investigation: Contemporary drought context and Combined Drought Indicator methodology.
Boundary: The March 2026 page warns of known soil-moisture-model issues in parts of the eastern domain; those areas require caution.
https://joint-research-centre.ec.europa.eu/european-and-global-drought-observatories/current-drought-situation-europe_enSource 10
Water and climate impacts — Europe’s environment 2025
European Environment Agency · 2025
Use in this investigation: Water stress, drought, floods, water quality and management context.
Boundary: EU-wide averages conceal large seasonal and regional variation.
https://www.eea.europa.eu/en/europe-environment-2025/thematic-briefings/biodiversity-and-ecosystems/water-and-climate-impactsSource 11
Vegetation and soil feedbacks on the response of the African monsoon to orbital forcing in the early to middle Holocene
Kutzbach, Bonan, Foley and Harrison · Nature 384, 623–626 · 1996
Use in this investigation: Orbital forcing, strengthened African monsoon and vegetation/soil amplification during the Green Sahara.
Boundary: Model results concern North African monsoon dynamics; they are not a direct analogue for Europe.
https://www.nature.com/articles/384623a0Source 12
The time-transgressive termination of the African Humid Period
Shanahan et al. · Nature Geoscience 8, 140–144 · 2015
Use in this investigation: Spatially uneven and progressively later termination of humid conditions at lower latitudes.
Boundary: The African Humid Period did not end everywhere in one instantaneous switch.
https://www.nature.com/articles/ngeo2329Source 13
Rapid termination of the African Humid Period triggered by northern high-latitude cooling
Collins et al. · Nature Communications 8, 1372 · 2017
Use in this investigation: Evidence for rapid precipitation decline in parts of the Sahel-Sahara and interaction with high-latitude climate and feedbacks.
Boundary: This supports a rapid large-scale component but does not erase regional timing differences.
https://www.nature.com/articles/s41467-017-01454-ySource 14
Decadal-scale droughts disrupted the African Humid Period in the Sahara
Sylvestre et al. · Nature · 2026
Use in this investigation: Latest Lake Yoa evidence that the humid interval contained sharp decadal droughts and climate variability.
Boundary: Local and regional drought episodes did not mean the whole humid period had already ended.
https://www.nature.com/articles/s41586-026-10336-7Source 15
Early warning signals of the termination of the African Humid Period(s)
Trauth et al. · Nature Communications 15, 3697 · 2024
Use in this investigation: Multi-millennial environmental record, drought recurrence and transition behaviour.
Boundary: Early-warning interpretation from one regional archive must not be presented as a universal predictive rule.
https://www.nature.com/articles/s41467-024-47921-1Source 16
African humid periods triggered the reactivation of a large river system in Western Sahara
Skonieczny et al. · Nature Communications 6, 8751 · 2015
Use in this investigation: Geomorphological evidence for major palaeodrainage and sustained humid-period runoff.
Boundary: A buried palaeoriver demonstrates former hydrology, not continuous forest cover across the whole Sahara.
https://www.nature.com/articles/ncomms9751Source 17
Sediment and pollen evidence for an early to mid-Holocene humid period in the eastern Sahara
Ritchie, Eyles and Haynes · Nature 314, 352–355 · 1985
Use in this investigation: Lake sediment and pollen evidence for savanna woodland and standing water in today’s hyperarid Sahara.
Boundary: Site evidence must not be inflated into a single uniform biome across North Africa.
https://www.nature.com/articles/314352a0Source 18
Holocene vegetation zonation in the eastern Sahara
Ritchie and Haynes · Nature 330, 645–647 · 1987
Use in this investigation: Pollen evidence for grassland and savanna vegetation gradients in regions now hyperarid.
Boundary: Vegetation was zoned by latitude and moisture; “the Sahara was jungle” is unsupported.
https://www.nature.com/articles/330645a0Source 19
Continued Atlantic overturning circulation even under climate extremes
Baker et al. · Nature 638, 987–994 · 2025
Use in this investigation: Current model evidence that strong weakening is plausible while complete collapse is not produced across the assessed 34-model extreme experiments.
Boundary: This does not remove AMOC uncertainty or prove that collapse is physically impossible.
https://www.nature.com/articles/s41586-024-08544-0Source 20
Past hydroclimate extremes in Europe driven by Atlantic jet stream and recurrent weather patterns
Brönnimann et al. · Nature Geoscience · 2025
Use in this investigation: Six-century context for jet position, drought and flood patterns in Europe.
Boundary: Recent jet behaviour remained within reconstructed historical variability in the study; this does not negate greenhouse-driven future risk.
https://doi.org/10.1038/s41561-025-01654-ySource 21
High temporal variability, not a trend, dominates Mediterranean precipitation
Nature · 2025
Use in this investigation: Long-observation evidence that basin-wide precipitation trends are difficult to isolate from large temporal variability.
Boundary: Lack of a clean historical basin-wide precipitation trend does not contradict projected drying, increasing evaporative demand or soil-moisture decline.
https://doi.org/10.1038/s41586-024-08576-6Source 22
Severe and long-lasting meteorological drought events develop from precipitation deficits of mixed continental and oceanic origin
Vicente-Serrano et al. · Communications Earth & Environment 5, 580 · 2024
Use in this investigation: Mechanisms and moisture-source complexity behind long droughts.
Boundary: Drought causation cannot be reduced to one ocean or atmospheric driver.
https://www.nature.com/articles/s43247-024-01755-3Source 23
Future increase in European compound events where droughts end in heavy precipitation
Steensen et al. · npj Climate and Atmospheric Science 8, 267 · 2025
Use in this investigation: Compound-risk framing: drying and damaging heavy rainfall can occur in sequence.
Boundary: The study uses an intermediate-emissions regional-model ensemble and reports uncertainty around the increase.
https://www.nature.com/articles/s41612-025-01139-0Source 24
Building climate-resilient agriculture in Europe — an economic perspective
European Environment Agency · 2026 current publication
Use in this investigation: Agricultural exposure, regional differences, adaptation and economic consequences.
Boundary: Economic projections depend on scenario, crop, adaptation and market assumptions.
https://www.eea.europa.eu/en/analysis/publications/building-climate-resilient-agriculture-in-europe-an-economic-perspectiveSource 25
Climate Change 2022 — Impacts, Adaptation and Vulnerability, Chapter 4: Water
Intergovernmental Panel on Climate Change · 2022
Use in this investigation: Hydrological extremes, Mediterranean agricultural drought and water-system risks by warming level.
Boundary: Global chapter findings must be tied to the relevant European or Mediterranean subsection.
https://www.ipcc.ch/report/ar6/wg2/chapter/chapter-4/Source 26
Article 1 — Use of Terms
United Nations Convention to Combat Desertification
Use in this investigation: Controlling distinction between desertification, drought and land degradation in drylands.
Boundary: The legal definition applies to arid, semi-arid and dry sub-humid areas and includes both climatic variation and human activity.
https://www.unccd.int/article-1-use-termsSource 27
Tassili n’Ajjer
UNESCO World Heritage Centre
Use in this investigation: Rock art and archaeological evidence recording climatic change, wildlife migration and human life on the edge of the Sahara.
Boundary: The UNESCO description supports environmental and cultural change; individual images carry separate rights conditions.
https://whc.unesco.org/en/list/179Source 28
A new tool maps the state of soil health across Europe
European Commission Joint Research Centre / EU Soil Observatory · 2023
Use in this investigation: EU soil-health baseline and multiple degradation pressures.
Boundary: The 61% unhealthy-soil estimate is based on available indicators and is described as an underestimate because some threats lack data.
https://joint-research-centre.ec.europa.eu/jrc-news-and-updates/new-tool-maps-state-soil-health-across-europe-2023-03-13_enSource 29
EU Soil Observatory — Data
European Commission Joint Research Centre
Use in this investigation: European Soil Data Centre, LUCAS Soil observations and authoritative soil-property and threat datasets.
Boundary: Dataset licences, resolution and reference years must be recorded for each exported map.
https://joint-research-centre.ec.europa.eu/eu-soil-observatory-euso/eu-soil-observatory-data_enSource 30
Soil protection
European Commission Joint Research Centre
Use in this investigation: Erosion, soil organic matter, compaction, salinisation, sealing and other European soil threats.
Boundary: General overview; numerical claims require the named underlying dataset or study.
https://joint-research-centre.ec.europa.eu/projects-and-activities/soil-protection_enSource 31
Copernicus Interactive Climate Atlas
Copernicus Climate Change Service / ECMWF
Use in this investigation: Reproducible maps and time series by warming level, season, period and region; exact source route for original SCRIBE climate graphics.
Boundary: Every exported graphic must retain variable, model ensemble, scenario or warming level, baseline, season and data credit.
https://atlas.climate.copernicus.eu/atlasSource 32
European State of the Climate 2025 — Soil moisture
Copernicus Climate Change Service / ECMWF · 2026 publication covering 2025
Use in this investigation: 2025 European surface-soil-moisture context, ERA5-Land and satellite data, and downloadable graphics/data.
Boundary: One year remains context; surface and root-zone products have different depths and methods.
https://climate.copernicus.eu/esotc/2025/soil-moistureSource 33
AR6 Working Group III Carbon Dioxide Removal Fact Sheet and Full Report
Intergovernmental Panel on Climate Change · 2022
Use in this investigation: Definition, roles, constraints and trade-offs of carbon dioxide removal in mitigation pathways.
Boundary: CDR methods differ in durability, cost, energy, land, water and storage; removals do not replace deep emissions reductions.
https://www.ipcc.ch/report/ar6/wg3/resources/factsheets/Source 34
State of Carbon Dioxide Removal — Third Edition
State of CDR consortium led by the University of Oxford and partner institutions · 2026
Use in this investigation: Current deployment, costs, potentials, durability and scale constraints across carbon-removal methods.
Boundary: Scenario need is not the same as demonstrated present deployment; method-specific uncertainty must remain visible.
https://www.stateofcdr.org/Source 35
European Water Resilience Strategy
European Commission, Directorate-General for Environment · 2025
Use in this investigation: Restore and protect the water cycle, build a water-smart economy and secure clean, affordable water.
Boundary: Policy objectives are not evidence that every intervention has already achieved its intended effect.
https://environment.ec.europa.eu/publications/european-water-resilience-strategy_enSource 36
Commission Recommendation on Water Efficiency First — Guiding Principles
European Commission, Directorate-General for Environment · 2025
Use in this investigation: Demand management, efficiency, leakage reduction, reuse and water-resilience decision principles.
Boundary: Efficiency can create rebound effects unless total abstraction and basin limits are controlled.
https://environment.ec.europa.eu/publications/commission-recommendation-water-efficiency-first-guiding-principles_enThe full controlled register covers observations, projections, drought and water stress, desertification terminology, soil data, Green Sahara evidence, circulation uncertainty, mitigation, carbon removal and water resilience. Source approval does not automatically clear figures or media for reuse.