Week 6 — Beyond Carbon: Water, Food & Social Systems

CVEN 5019 · Integrated Core · Fall 2026 · Week 6

Beyond Carbon:
Water, Food & Social Systems

Extending the assessment toolkit to the other planetary boundaries — water footprint, food system LCA, social LCA, environmental justice, and the full picture of sustainable technology design.

Instructor Carlo Salvinelli ★ Integration Day 3.5-hr cross-section workshop ESG Report assignment introduced (due Week 7)

Session Overview

Topics

Carbon tunnel vision — why optimizing for CO₂ alone creates new problems
Water-Energy-Food (WEF) Nexus — interdependencies and design trade-offs
Water footprint methodology — ISO 14046, blue/green/grey water
Water scarcity assessment — AWARE method and basin-level factors
Food system impacts — land use, N₂O, livestock, food loss
Land use & biodiversity — LULC in LCA, TNFD framework
Social LCA — UNEP guidelines, social impact categories
Environmental justice — distributional impacts of clean transitions
Course toolkit synthesis — the full picture
★ Integration Day — cross-section workshop

Learning Objectives

Explain the planetary boundary framework for freshwater and biosphere integrity and their relevance to technology design
Calculate blue, green, and grey water footprints using ISO 14046 methodology
Apply AWARE water scarcity weighting factors to distinguish between water-abundant and water-scarce geographies
Identify the dominant environmental and social impacts of food systems and evaluate technology interventions
Describe the Social LCA framework (UNEP/SETAC guidelines) and its five stakeholder categories
Apply environmental justice principles to evaluate the distributional impacts of a sustainable technology transition

Carbon Tunnel Vision — The Risk of Single-Metric Optimization

Carbon tunnel vision (term coined by Jan Konietzko, 2021): the dangerous tendency to focus exclusively on CO₂ as the metric of environmental performance, ignoring all other planetary boundaries
Example 1 — Solar PV: dramatically reduces CO₂ emissions vs. fossil electricity. But silicon production requires large quantities of water (semiconductor fabs); silver extraction for panels creates toxic tailings; land use for utility-scale solar can displace habitat and agricultural land.
Example 2 — "Green" hydrogen: near-zero Scope 1 emissions when produced by electrolysis. But: electricity demand could stress grid and water supplies; platinum and iridium catalyst requirements; pressurized storage safety and infrastructure impacts.
Example 3 — Electric buses: zero tailpipe CO₂ and PM₂.₅ in the city. But: battery manufacturing creates cobalt and lithium impacts in DRC and Chile, often with severe labor and community impacts.

Planetary Boundaries Beyond Climate

Freshwater Use

Boundary: 4,000 km³/yr consumptive. Current use: ~4,600 km³/yr — already exceeded. Technology transitions that shift energy sources can dramatically change water consumption patterns.

Biosphere Integrity

Most severely exceeded boundary. Extinction rate is 100–1,000× background. Land use change for biofuels, solar farms, and mining are direct technology-linked drivers.

Biogeochemical Flows

Nitrogen and phosphorus cycles both exceeded. Fertilizer runoff (N₂O and eutrophication) is a major food system impact that can be worsened by some "green" agricultural technologies.

Novel Entities

Plastics, PFAS, nanomaterials, synthetic biology — sustainability technologies can introduce new chemical risks if not assessed through a full toxicity lens.

The Water-Energy-Food (WEF) Nexus

Water needs energy: pumping, treating, distributing water accounts for ~4% of global electricity. Desalination is 3–10 kWh/m³. In the US, water-related energy is ~13% of total energy consumption.
Energy needs water: thermoelectric power plants (coal, nuclear, gas) require 40–400 liters of freshwater per kWh for cooling. Hydropower withdrawals are even larger but mostly non-consumptive.
Food needs both: Agriculture accounts for ~70% of global freshwater withdrawals and ~30% of global energy use. Irrigation systems, fertilizer production (Haber-Bosch uses ~1.5% of world energy), and cold chains all tie food to water and energy.
Design implication: a technology decision in one system creates ripple effects in the other two. Drought + heat stress → less hydropower → energy price spike → higher irrigation pumping costs → food price shock.

WEF Trade-Off Examples

Biofuels

Reduces fossil fuel dependence (energy ✓) but competes with food crops for land and water (food ✗, water ✗). Net GHG benefit depends heavily on feedstock and land use change.

Desalination

Addresses freshwater scarcity (water ✓) but is highly energy-intensive (energy ✗) and brine discharge harms marine ecosystems (food ✗ via fisheries).

Precision Agriculture

IoT sensors + variable-rate irrigation can cut water use 20–30% (water ✓) with minimal yield penalty (food ✓). Energy demand from sensors/computing is marginal (energy ~neutral).

Vertical Farming

Eliminates weather risk (food ✓) and cuts water use 95% vs. field (water ✓) but uses 100–250 kWh/kg of produce — only low-CO₂ if powered by clean electricity (energy ?).

Water Footprint Methodology — ISO 14046

Blue Water

Surface and groundwater consumed (evaporated or incorporated into product). Not returned to the source watershed. Irrigation, industrial cooling, product water content.

Green Water

Rainwater consumed by plants (evapotranspiration). Relevant for agricultural and forestry products. Does not deplete surface or groundwater stocks directly.

Grey Water

Freshwater required to dilute pollutants to ambient water quality standards. Proxy for water quality impact. Calculated as: pollutant load ÷ (max allowable conc. − background conc.)

Why not just report liters withdrawn? Because 1 liter withdrawn in Norway (abundant rainfall, high groundwater recharge) has a completely different scarcity impact than 1 liter withdrawn in the Atacama Desert
ISO 14046 (2014): standard for water footprint of products, processes, and organizations — complementary to ISO 14040 LCA, can be embedded in a standard LCA study
Water footprint = volume × scarcity weighting factor (AWARE, water stress index, or similar)

AWARE method (Boulay et al., 2018): Available WAter REmaining — characterization factor = 1 / (freshwater availability per watershed minus human and aquatic ecosystem demands). Range: 0.1 (high availability) to 100 (extreme scarcity).
Example: semiconductor fab using 10 million liters/yr in Phoenix, AZ (AWARE factor ~85) has the same scarcity impact as using 850 million liters/yr in Iceland (AWARE factor ~0.1)
Water footprint now included in ReCiPe 2016, EF 3.1, and TRACI 2.1 as standard LCIA impact categories — no separate study needed if using these methods in OpenLCA

Water Scarcity — Regional Context Matters Enormously

AWARE factors by region (higher = more scarce). Same volume withdrawn has vastly different impact depending on basin.

Iceland

0.1

Norway

0.3

Colorado (USA)

42

Arizona (Phoenix)

85

Atacama (Chile)

100

Indus (Pakistan/India)

97

Sub-Saharan Africa (avg)

55

Battery and semiconductor manufacturing, solar panel production, and data centers all have significant water footprints — and companies are increasingly siting facilities in water-stressed regions. Water scarcity is an emerging material risk for technology companies (TCFD, CDP Water Security).

Food System Impacts — Land, N₂O, Biodiversity & Loss

Food systems account for ~34% of global GHG emissions (Crippa et al., Nature Food, 2021) — dominated by land use change (deforestation), livestock (enteric fermentation CH₄, manure N₂O), and synthetic fertilizers
N₂O from fertilizers: agricultural soils emit ~3 Gt CO₂e/yr of N₂O — GWP₁₀₀ of 273 makes it extraordinarily potent. Technologies that improve nitrogen use efficiency (precision application, nitrification inhibitors, slow-release fertilizers) have high leverage.
Livestock: cattle alone represent ~14.5% of global GHG emissions (FAO). Methane from enteric fermentation (ruminants) is a short-lived climate forcer — high GWP₂₀ of ~82.5 makes near-term reduction especially valuable
Food loss and waste: ~30–40% of food produced globally is wasted. If food waste were a country, it would be the third-largest emitter. Cold chain technology, smart packaging, and precision dating all address this.

Land Use & Biodiversity in LCA

Land use change (LUC): deforestation for agriculture is one of the largest single emission sources globally (~4 Gt CO₂e/yr). LCA models LUC using GHG Protocol LUC accounting or IPCC Tier 1 factors, but spatial dynamics are hard to capture
Biodiversity impact: ReCiPe 2016 includes a "land use" midpoint (m² × yr, crop-equivalent) and an endpoint (species lost). UNEP BSAF (Biodiversity Sensitivity Area Factors) emerging as more spatially resolved method
TNFD (Taskforce on Nature-Related Financial Disclosures): launched 2023 — nature-equivalent of TCFD for corporate disclosure. LEAP assessment approach: Locate → Evaluate → Assess → Prepare. Increasingly material for food, ag, and land-intensive sectors

Part 2 · Social Dimension

Social LCA

Environmental LCA accounts for impacts on the natural world. Social LCA accounts for impacts on people along the value chain — workers, communities, and society.

Social LCA — Methodology & Framework

Social LCA (S-LCA): a methodology for assessing social and socioeconomic impacts of products and technologies along their life cycle. Developed by the UNEP/SETAC Life Cycle Initiative — guidelines published 2009, updated 2020.
Scope: covers impacts on workers, local communities, society, value chain actors, and consumers. Parallel structure to environmental LCA but with activity variables (hours of work) rather than physical flows as the functional unit basis.
Key distinction from env. LCA: S-LCA measures conditions experienced by people (e.g., whether workers earn a living wage) — not just emission quantities. Data is often qualitative or semi-quantitative.
ISO/TS 14072: provides guidance on organizational S-LCA — not yet as standardized as environmental LCA. Still an evolving field.
When to use it: consumer electronics supply chains (cobalt in DRC), solar panel manufacturing (Xinjiang cotton-equivalent labor issues), palm oil supply chains, garment industry

Five Stakeholder Categories

Poverty Alleviation as a Sustainable Technology Design Goal

SDG 1 (No Poverty) and SDG 10 (Reduced Inequalities) are among the most off-track SDGs — and technology deployment decisions directly affect both
Energy poverty: 730 million people lack access to electricity (IEA 2023). Off-grid solar (PAYG models — M-KOPA, d.light) has connected 150M+ people. But: who owns the technology infrastructure? Who captures the value?
Clean cooking: 2.3 billion people use solid fuels for cooking — 3.2 million deaths/yr from indoor air pollution (WHO). Improved cookstoves and LPG programs directly address SDG 3 (Health) and SDG 5 (Gender Equality, since women disproportionately bear the burden)
Technology design choices affect poverty outcomes: a rooftop solar program that requires home ownership excludes renters. A precision agriculture platform that requires expensive smartphones excludes smallholders.

Design Principles for Poverty Alleviation

Affordability

Design price points, payment models, and subsidy structures that enable access for low-income households — not just cost-parity with existing solutions

Local Value

Maximize local economic value capture: local manufacturing, local technician workforce, local ownership structures, royalty-sharing

Inclusive Design

Co-design with affected communities. Build literacy requirements and physical interface design around actual user capabilities, languages, and contexts

Avoid Lock-in

Proprietary platforms and vendor lock-in transfer value to the technology company. Open standards and interoperability protect user and community interests

Environmental Justice — Who Bears the Costs of "Green" Transitions?

Environmental justice (EJ): the principle that all people deserve equal protection from environmental harms and equal access to environmental benefits — regardless of race, income, national origin, or geography
Historical pattern: fossil fuel infrastructure (refineries, pipelines, power plants) is disproportionately sited near communities of color and low-income communities. Same risk exists for some "clean" infrastructure (waste-to-energy, biomass plants).
The "green transition" paradox: lithium mining for EV batteries in Chile and Bolivia, cobalt mining in DRC, rare earth mining in Myanmar — impacts are borne by communities with the least political power and the least benefit from the resulting clean technology
Just Transition: a framework for ensuring that the shift to a low-carbon economy is equitable — protecting and supporting workers and communities that are disproportionately affected (e.g., coal mining communities)

EJ in Engineering and Business Practice

Siting Decisions

Use EPA's EJScreen tool to assess cumulative environmental burden before siting facilities. Require EJ analysis in EIA for new clean energy projects.

Benefit Sharing

Community benefit agreements (CBAs) for renewable energy projects. Shared ownership models. Royalties and employment guarantees for host communities.

Supply Chain

Responsible Minerals Initiative (RMI) and OECD Due Diligence Guidance for minerals. Conflict mineral reporting. Living wage audits in Tier 2+ suppliers.

Health Impact

Quantify health impacts of technology deployment using disability-adjusted life years (DALYs) — endpoint metric in ReCiPe LCA that can reveal EJ patterns spatially.

Course Toolkit Synthesis — The Full Picture

Six weeks of integrated methods — each addressing a different dimension of sustainable technology impact.

📊

GHG Accounting

Quantifies climate impact across Scope 1/2/3. Foundation of all net zero commitments. (Week 2)

📡

DMRV

Automates and verifies GHG measurement using sensors, satellites, and blockchain. (Week 3)

🔍

Process LCA

Multi-dimensional environmental impact across full product lifecycle — 15+ categories. (Week 4)

🎯

Net Zero Strategy

Translates accounting into organizational decarbonization roadmaps and procurement action. (Week 5)

💧

Water & Food LCA

Extends environmental assessment to freshwater consumption, food systems, land use, and biodiversity. (Week 6)

👥

Social LCA & EJ

Captures human impacts along value chains — labor rights, community wellbeing, equity, poverty. (Week 6)

No single tool covers everything. The systems thinking framework from Week 1 is what integrates them — you choose the right tool for the question, apply it rigorously, and interpret results with awareness of what each tool cannot see.

💬

Week 6 · Social LCA Exercise (20 min)

Identify the top three social impact hotspots in the lithium-ion battery supply chain — and propose one engineering and one business intervention for each.

Supply chain stages to analyze:
1. Lithium mining — Atacama Salt Flats, Chile (indigenous community water rights)
2. Cobalt mining — Katanga Province, DRC (artisanal mining, child labor, health risks)
3. Cell manufacturing — Jiangsu Province, China (labor hours, wages, occupational health)
4. Battery pack assembly — US/EU (automation displacement, supply chain job creation)
5. End-of-life — informal e-waste recycling, Ghana/India/Philippines (toxic exposure)

For each hotspot, identify:
• Affected stakeholder category (workers, community, society, etc.)
• Most relevant UNEP S-LCA impact subcategory
• Engineering design intervention that reduces the impact (e.g., battery chemistry change, recyclability design)
• Business/procurement intervention (e.g., supplier audit, certification requirement, financial incentive)

Teams present findings. Compare engineering vs. business responses — where do they complement? Where do they conflict?

★ Integration Day — Week 6

★ Integration Day · Shared with Policy & Regulation and Technology Transitions Courses

Workshop: "The Full Sustainability Assessment — Applying All Three Course Lenses to a Colorado Technology Case"

The second Integration Day of the term. 3.5 hours with students and faculty from all three Integrated Core courses.

Today's case: A proposed large-scale solar + battery storage facility in southeastern Colorado. The facility would displace 1,200 MW of coal capacity but: (1) requires 3,000 acres of rangeland, (2) sources batteries with cobalt from DRC, (3) is sited adjacent to a low-income rural community with aging water infrastructure, (4) will create 200 permanent jobs but displace 850 coal mine workers 40 miles away.

Cross-section group tasks (groups of 8, mixed across all three courses):
• Principles for Sustainable Tech Design (this course): Conduct a scoping LCA comparing the new facility to the coal baseline across climate, water, land use, and social impact categories. What are the net impacts?
• Policy & Regulation: What regulatory approvals are required? What environmental justice policies apply? How should the community benefit agreement be structured?
• Technology Transitions: What transition management strategies would minimize harm to displaced coal workers and the host community while accelerating deployment?

Deliverable: Each group presents a joint recommendation that integrates all three lenses. Faculty panel evaluates on coherence and systems thinking quality.

Key Takeaways — Week 6 & Course Synthesis

Carbon tunnel vision is a real and dangerous cognitive bias — it leads to "sustainable" solutions that solve climate change while worsening water scarcity, biodiversity loss, or social inequality. Full LCA is the antidote.
Six of nine planetary boundaries are already exceeded — and all six are technology-influenced. Technology design must operate within all of them, not just the climate boundary.
Water footprint and social impacts are increasingly material business risks: water scarcity is a TCFD physical risk; supply chain labor conditions are a mandatory CSRD disclosure; biodiversity loss is emerging under TNFD. Both engineering and business students need fluency here.
Environmental justice is not optional — distributional impacts are a core dimension of sustainable design. Who benefits and who bears the costs must be explicitly analyzed, not assumed away.

Social LCA completes the picture that environmental LCA and GHG accounting leave incomplete — workers, communities, and equity deserve the same rigorous assessment as carbon emissions.
The course toolkit works as an integrated system: GHG accounting → DMRV → Process LCA → Net Zero Strategy → Water/Food → Social. Each builds on the prior. Systems thinking from Week 1 is the connective tissue.

Weeks 7–8: Justice & Equity design principles → Design Sprint → Capstone Presentations. Apply the full toolkit in your Capstone Sustainable Technology Assessment Project.

ESG Analysis Report introduced this week — due end of Week 7.