Research

Understanding systems through their flows

My work combines biophysical accounting, network science, historical analysis and foresight to understand what system structure makes possible, efficient or vulnerable.

01 / Composition & vulnerability

Linking agricultural composition to performance

Using detailed nitrogen-flow networks, I study how crop mixes and herd structure are associated with agro-environmental efficiency and distinct forms of metabolic vulnerability across 33 French territories from 1852 to 2014.

SSRN preprint
Agricultural vulnerability metrics
Circular dendrogram of the inductive typology of French agricultural systems
Dendrogram of the inductive typology: observed systems are grouped by similarity in their metabolic signatures.
02 / Quantitative environmental history

Reconstructing 162 years of agricultural change

Unsupervised classification identifies recurring biophysical structures and reconstructs a metabolic history of French regional agriculture. Over- and under-represented transitions are consistent with forms of path dependence.

Historical dataset
03 / Agricultural foresight

Putting contrasted visions in a common physical framework

I translate stakeholder scenarios into E-GRAFS to compare assumptions and trade-offs involving livestock, diets, inputs, trade and competing uses of biomass.

Scenario data
Qualitative positioning of French agricultural scenarios
Classification tree for metabolic phases of an agro-food network
One of the metabolic-phase classification trees presented in the thesis appendix.
04 / Chemical-network formalism

Exploring feasible regimes beyond fixed scenarios

With Jérémie Unterberger, we reformulate agro-food nitrogen metabolism as a continuous-time flow network inspired by chemical reaction networks, allowing us to study metabolic phases and transitions between dominant recycling cycles.

arXiv preprint
05 / Energy · 2026, ongoing

Multisectoral energy dependence in the EU-27

In September and October 2026, I am developing a multisectoral model of energy dependence across the 27 EU Member States, extending my work on material dependencies beyond agriculture.

LNG carrier at sea, illustrating international energy supply chains
Illustration — maritime LNG transport. Photograph: Leonhard Lenz / Wikimedia Commons, CC0. No result figure from this work is public yet.
Outputs

Preprints, data and software

None of the articles below has yet been published in a peer-reviewed journal.

Preprint
Metabolic signatures of long-term territorial French Agro-Food Systems with E-GRAFS
A. Fauste-Gay, J. Le Noë, M. Maguet, O. Vidal, L. Mouysset
Preprint
Network analysis reveals phase transitions in agro-food nitrogen systems with contrasting feeding capacity and land requirement
A. Fauste-Gay, J. Unterberger, O. Vidal, L. Mouysset
Data
Dataset for E-GRAFS: France, 33 regions, 1852–2014
M. Maguet, A. Fauste-Gay
Software
E-GRAFS
Open-source Python model