Compendium

Sustainable Engineering and the Circular Economy

19 min read

Sustainable Engineering and the Circular Economy

Sustainable engineering is the discipline of designing, producing, operating, and end-of-life-managing products and systems so that environmental, social, and economic consequences across their full lifecycle are accounted for, minimised, and where feasible regenerated. Modern practice is rooted in Life-Cycle Assessment (LCA), translated into corporate disclosure through frameworks such as ISSB / GRI / SBTi, and operationalised in industry via embodied-carbon accounting, material-flow circularity (the Ellen MacArthur “9 R’s”), and sector-specific decarbonisation roadmaps (concrete, steel, plastics, energy, water). By 2025 the global market for sustainability software + advisory + verification services exceeded USD 80 B (BloombergNEF + IDC), and over 7000 companies have validated SBTi targets.

1. Life-Cycle Assessment (LCA)

1.1 Standards

  • ISO 14040:2006 — principles + framework.
  • ISO 14044:2006/Amd 2:2020 — requirements + guidelines.
  • ISO 14067:2018 — carbon footprint of products.
  • ISO 14025 + EN 15804+A2 — Environmental Product Declarations (EPDs).
  • PAS 2050 (BSI) — predecessor of ISO 14067.
  • GHG Protocol Product Standard + Corporate Standard — WRI/WBCSD; Scope 1/2/3 categorisation.

1.2 LCA stages

  1. Goal + Scope definition — functional unit (e.g., “1 t cement”, “1 vehicle-km”, “1 kWh delivered”), system boundary (cradle-to-gate, cradle-to-grave, cradle-to-cradle), allocation rules.
  2. Life Cycle Inventory (LCI) — material + energy flows; usually computed via databases.
  3. Life Cycle Impact Assessment (LCIA) — characterisation factors map flows to impact categories (GWP, acidification, eutrophication, ozone depletion, ETP, land use, water scarcity).
  4. Interpretation — sensitivity + uncertainty (Monte Carlo).

1.3 LCIA methods

  • ReCiPe 2016 — RIVM (Netherlands) + Radboud Univ. Midpoint + endpoint; H/A/I cultural perspectives.
  • IMPACT World+ — joint CIRAIG (Polytechnique Montréal) + Ecoinvent + DTU.
  • TRACI 2.1 — Tool for Reduction + Assessment of Chemicals + other environmental Impacts (US EPA). Default for US.
  • CML-IA baseline — Leiden Univ; impacts at midpoint only.
  • PEF / OEF — Product / Organisation Environmental Footprint (EU JRC); 16 categories; mandatory for some EU sectors 2025+.
  • AWARE — water scarcity factor (UNEP-SETAC).

1.4 Databases

  • Ecoinvent v3.10 (Swiss; ~25,000 processes, license fee-based).
  • GaBi Sphera Pro (Sphera, formerly thinkstep).
  • NREL US LCI + USDA LCA Commons (US public).
  • Agribalyse (France ADEME).
  • Carnegie-Mellon EIO-LCA (Economic Input-Output LCA; sector-level rapid screening).
  • Embodied Carbon in Construction Calculator EC3 (Building Transparency 2019; founded Stacy Smedley + Phil Northcott; >300,000 product EPDs as of 2024).
  • ICE — Inventory of Carbon + Energy (Hammond + Jones, Univ of Bath; v3.0 2019).

1.5 LCA software

  • SimaPro (PRé Sustainability; Amersfoort NL) — industry-standard since 1990.
  • GaBi → Sphera LCA for Experts (Stuttgart + Chicago).
  • openLCA (GreenDelta, Berlin; free + open source).
  • Ecochain Mobius + Helix (Amsterdam).
  • Sustainable Minds + Trayak / Compass (packaging-focused).
  • EcoChain Helix, One Click LCA (Helsinki; ConstructionLCA), CarbonChain (London).

1.6 LCA pitfalls

  • Allocation choices (co-product, mass vs economic vs system expansion).
  • Background-data ageing (Ecoinvent processes can lag actual grid mix by 5+ yr).
  • Use-phase boundary errors (electronics 20–80 % of lifetime impact often in use phase).
  • Misalignment between functional unit + comparison (PET bottle vs aluminum can).

2. Embodied carbon + per-material intensities

Embodied carbon (also called “upfront carbon” or “A1–A3 cradle-to-gate” per EN 15804) is the GHG emitted to produce + transport materials before installation. Material-intensity benchmarks (kg CO₂e per kg of material, A1–A3, EU-EPD average 2024):

MaterialEmbodied carbon kg CO₂e/kgNotes
Primary aluminum (global avg)8–15EU-RER 8.5; China heavy coal grid 18+
Recycled aluminum0.5–1.095 % energy savings vs primary
Crude steel BF-BOF1.85 (world steel avg 2023)China 2.0; Sweden HYBRIT < 0.1 (pilot)
EAF steel (recycled scrap)0.4–0.6Depends on grid mix
Hydrogen-DRI steel< 0.5 with green H2Stegra Boden targeting 0.1 by 2027
Portland cement OPC0.7–0.9Clinker factor ~0.85; varies by kiln
GGBS/CEM III concrete0.4–0.6Slag substitution
LC3 limestone calcined clay cement0.4Scrivener EPFL; 40 % CO₂ reduction
Glass (float)0.8550 % cullet typical
Virgin PET2.7
Recycled PET (rPET)1.1Mechanical recycle
HDPE virgin1.9
CLT cross-laminated timber0.1–0.5Stores ~1.6 kg CO₂/kg dry wood biogenic carbon
Mass timber GLT0.2
Brick (clay)0.24
Granite stone0.07
Carbon fiber (PAN-based)24–31Most-carbon-intensive structural material
Lithium-ion battery (NMC811)50–80 kg CO₂/kWh cellDown from > 100 in 2020

Mass-flow + embodied-carbon hotspots are typically: clinker (cement); ironmaking (steel); electrolysis (aluminum); polyolefin cracking (plastics); calcination (cement); shipping (transport globalised goods).

3. Material flows + circular economy

3.1 Linear vs circular

The default industrial paradigm is linear (take-make-use-dispose). Circular economy preserves embodied value through cycling: design for longevity + repair + reuse + remanufacture + recycling. Ellen MacArthur Foundation (Cowes UK; founded 2009 by sailor Ellen MacArthur) is the most prominent advocacy + research org; partnered with WBCSD + EU Commission on the CE Action Plan (2015 + 2020).

3.2 The 9 R’s (Cramer + Potting, 2017; superseded older 3R / 4R / 6R)

  1. Refuse — reject unnecessary products.
  2. Rethink — share + multi-use.
  3. Reduce — efficiency in design + use.
  4. Reuse — second-hand + redirected.
  5. Repair — restore broken function.
  6. Refurbish — refresh older products.
  7. Remanufacture — restore to like-new with warranty.
  8. Repurpose — apply to a different function.
  9. Recycle — material-level recovery.

3.3 Product-as-a-Service (PaaS)

  • Philips Lighting → Signify “Pay-per-Lux” — Amsterdam Schiphol airport contract 2015+: Philips owns lighting, customer pays for lumen-hours.
  • Rolls-Royce “Power by the Hour” (originated 1962 for Bristol Siddeley) — engine availability rather than purchase; today TotalCare contracts.
  • Caterpillar Equipment-as-a-Service + HP Instant Ink + Managed Print.
  • Mud Jeans + Vigga + Lena Library consumer rental.

3.4 Industrial symbiosis

  • Kalundborg Eco-Industrial Park (Denmark since 1972) — Asnæs power station + Statoil refinery + Novo Nordisk + Novozymes + Gyproc + Kalundborg municipality exchanging steam + fly ash + sulphur + biomass + gypsum. > 30 exchanges; ~635,000 t/yr CO₂ savings; ~3 M m³ water saved annually.
  • NISP UK National Industrial Symbiosis Programme (Lombardi + Laybourn 2003–2013 government-funded; spawned 100+ regional programs).
  • Sotenäs + Norrköping Sweden + Hartberg Austria + Tianjin Economic-Technological Development Area China.

3.5 Urban mining

E-waste recovery — global 62 Mt 2024 (UN Global E-waste Monitor 2024); only 22 % formally collected. Recovery value ~USD 91 B (Cu + Au + Ag + Pd + Co + REE + plastics + glass).

  • Umicore (Brussels) — Hoboken Belgium smelter recovers Au + Ag + Pd + Pt + Rh + Cu + In + Te + Se + Sb + Bi from PCBs + catalysts + batteries.
  • Boliden Rönnskär (Sweden) + Aurubis Lünen (Germany).
  • DOWA Eco-System Japan + Mitsubishi Materials.

3.6 Cradle-to-Cradle (C2C)

McDonough + Braungart 2002 book; certification administered by Cradle to Cradle Products Innovation Institute (Oakland) — Basic / Bronze / Silver / Gold / Platinum levels evaluating material health + reuse + renewable energy + water + social fairness.

4. Recycling — sectoral deep dive

4.1 Metals (ferrous + non-ferrous)

Aluminum recycling consumes ~5 % of energy of primary smelting (95 % savings). End-of-Life Vehicles (EU ELV Directive 2000/53/EC + 2023 recast proposal) achieve ~85 % material recovery rate; targeting 95 % by 2030. Modern shredding + sortation:

  • Eddy current separators (non-ferrous from ferrous): Steinert KMS-K + EddyC + EddyC Fines, Bunting, Eriez.
  • Sensor-based sortation:
    • TOMRA Mining + Recycling AUTOSORT + X-TRACT (XRT, Bergen Norway).
    • Steinert XSS X-ray + UniSort PR / FINES NIR.
    • Stadler Anlagenbau (Altshausen DE) + Sesotec Varisort.
    • Greyparrot (London) — AI computer vision for waste sortation.
  • Heavy media + sink-float, shredders (Lindemann + Metso Outotec + Wendt Corp).

4.2 Battery recycling

Surging due to EV transition. ~140 GWh of EOL Li-ion expected by 2030 (BNEF). Process routes:

  • Pyrometallurgical — smelting to recover Co + Ni + Cu; lose Li + Al + graphite. Glencore Sudbury + Nikkelverk, Umicore Hoboken, Sumitomo Niihama.
  • Hydrometallurgical — leach + selective precipitation + solvent extraction. Brunp / CATL (largest Chinese), GEM Co, Huayou Cobalt, Redwood Materials, Li-Cycle Hub Network.
  • Direct cathode recycling — preserves cathode crystal structure; pioneered by OnTo Technology + Princeton NuEnergy + ReCell Center DOE Argonne.

Companies + sites:

  • Redwood Materials (Sparks NV; founded 2017 J.B. Straubel ex-Tesla CTO; closed-loop Li/Ni/Co/Mn, 95 %+ recovery; Carson City + South Carolina Berkeley County 2025 ramp; partnerships with Ford, Toyota, VW, BMW, Volvo, Panasonic).
  • Northvolt Revolt 2.0 — Skellefteå Sweden (Northvolt filed for bankruptcy Nov 2024, restructured 2025; Revolt unit retained).
  • Li-Cycle Holdings (NYSE LICY) — spoke-and-hub model; Hub Network construction paused Oct 2023 amid USD 1 B financing crunch + Glencore investment; restarted partial Apr 2024.
  • American Battery Technology (Reno NV; AMBT formerly).
  • Aqua Metals “AquaRefining” — electrochemical Pb-acid battery recycling, expanding to Li-ion.
  • Tata Chemicals + Attero Recycling India.
  • EcoBat Technologies + Eco-Bat (Pb-acid → Li expansion).
  • Cirba Solutions (Ohio + Lancaster OH; SK On + Worthington JV).
  • Ascend Elements (Westborough MA; Hydro-to-Cathode direct precursor synthesis).
  • EVE Energy + Ganfeng Recycling China.

4.3 Plastic recycling

  • Mechanical recycling — sort by polymer (NIR Tomra / Steinert / Pellenc ST), wash, shred, melt-pelletize. Workhorses: PET → rPET bottles + textile (CarbonLite formerly + Indorama Ventures + ALPLA + Plastipak), HDPE → bottle caps + pipe (Veolia + Suez + WM ARM), PP → consumer goods. Mechanical limits: contamination + heat-history degradation + colour reduction.
  • Chemical / molecular recycling — depolymerise back to monomer:
    • Carbios (Caen FR) — PETase enzyme; first industrial unit Longlaville 2025; partnered with L’Oréal, PepsiCo, Nestlé Waters, Suntory, On-Running, Salomon.
    • Loop Industries (Terrebonne QC) — methanolysis of PET to DMT + MEG; Indorama JV Reverberi Italy 2024.
    • Eastman Chemical — Kingsport TN + Normandy FR plants (Polyester Renewal Technology methanolysis + Carbon Renewal Technology gasification).
    • PureCycle Technologies (Nasdaq PCT) — P&G solvent-based PP recycling; Ironton OH plant operational 2023 with reliability ramp 2024.
  • Pyrolysis / advanced thermo-chemical — depolymerise mixed plastics to naphtha/oil. Plastic Energy (Madrid + Almería + Andalucía + Geleen NL with Total + SABIC), Brightmark Energy (Ashley IN; 100,000 t/yr plant 2024), Quantafuel (Skive DK), Nexus Circular (Atlanta).
  • Gasification — Eastman + Encina + Agilyx + Braven Environmental.

Policy drivers: EU Single-Use Plastics Directive (SUP) 2019/904 banned cotton-bud sticks, cutlery, balloon sticks, food containers in EPS, etc. 2021+. PPWR Packaging + Packaging Waste Regulation adopted Apr 2024 — recyclability + recycled content targets to 2040. Deposit Return Schemes (DRS) mandatory across EU + UK by 2025; >90 % collection rates achievable.

4.4 Concrete + cement

Cement is ~8 % global anthropogenic CO₂ (IEA). Decarbonisation levers:

  • LC3 (Limestone Calcined Clay Cement) — Karen Scrivener EPFL + Cuba + India consortium 2010s. Commercial deployment from 2024 onward (TGCT India; LC3.tech consortium). ~40 % CO₂ reduction at material cost-neutral.
  • CarbonCure Technologies (Halifax NS; founded Robert Niven 2012) — CO₂ injected into ready-mix; mineralisation as CaCO₃ inside concrete; 1500+ plants 2024.
  • Solidia Technologies (Piscataway NJ) — modified clinker chemistry + CO₂-cured concrete.
  • Brimstone Energy (Oakland) — lime-free cement via calcium silicate rocks (anorthosite); pilot 2024.
  • Sublime Systems (Somerville MA) — electrochemical clinker route, MIT spinout.
  • Heidelberg Materials evoZero — first carbon-captured cement, Brevik Norway CCS plant operational 2024 (Northern Lights value chain).
  • Geopolymers — Joseph Davidovits 1979; activated fly ash + slag + metakaolin; commercial: Wagners Earth-Friendly Concrete EFC, Zeobond E-Crete.
  • Magnesium oxychloride (Sorel cement) + TecEco eco-cement — niche.
  • Recycled Concrete Aggregate (RCA) — EU C&DW Directive 70 % recycling target by 2020 already met; quality-control bottleneck for structural reuse.

4.5 Steel decarbonisation

Steel is ~7 % global CO₂. Pathways:

  • H2-DRI Hydrogen Direct Reduced Iron
    • HYBRIT — SSAB + LKAB + Vattenfall joint venture (Sweden); pilot Luleå 2020; first commercial-scale demo planned Gällivare 2026; first “green steel” delivered Volvo + Mercedes-Benz 2021.
    • Stegra (formerly H2 Green Steel; Boden Sweden) — 5 Mt/yr plant scheduled first steel 2026; Schaeffler + BMW + Porsche + Mercedes + Scania off-takers.
    • ArcelorMittal Sestao Spain + Hamburg + Gent + Dunkerque + Bremen + Eisenhüttenstadt — total ~10 Mt/yr DRI conversion planned by 2030.
    • Salzgitter SALCOS — first H2-DRI module commissioned 2026 (Lower Saxony).
    • ThyssenKrupp tkH2Steel — Duisburg 2.5 Mt/yr DRI funded Mar 2023 EU + German State Aid.
    • China Baowu + HBIS + Ansteel — domestic green-steel programs.
  • Molten Oxide Electrolysis (MOE) — Boston Metal (Woburn MA; Sadoway MIT spinout) — directly electrolyse iron oxide to molten Fe + O₂ at >1500 °C; pilot 2024; full-scale 25 kt/yr unit 2026.
  • EAF Electric Arc Furnace from scrap — Nucor + Steel Dynamics + Commercial Metals + ArcelorMittal Dofasco + Gerdau + Liberty Steel; ~30 % global crude steel in 2024, rising to 50 % by 2050 (IEA NZE scenario).
  • CCS-equipped BF-BOF — Al Reyadah Abu Dhabi (Emirates Steel + ADNOC) operational 2016; ArcelorMittal Steelanol Gent (carbon-to-ethanol biofermentation).
  • Green premium — 100–300 USD/tonne over BF-BOF reference, narrowing 2025–2030.

4.6 Wood + bio-based

Mass-timber construction stores biogenic carbon + has low embodied carbon vs steel + concrete.

  • CLT (Cross-Laminated Timber) — Stora Enso Ybbs/Bad St Leonhard + KLH Massivholz + Binderholz + Mayr-Melnhof Holz + Structurlam (BC; sold to KLH 2023).
  • GLT (Glulam) + LSL (Laminated Strand) + DLT (Dowel-Laminated) + NLT (Nail-Laminated) + MPP (Mass Plywood Panel) — Freres Engineered Wood Oregon.
  • Mass-timber landmark buildings:
    • Brock Commons Tallwood House, UBC Vancouver (2017, 18 storeys, 53 m).
    • Mjøstårnet, Brumunddal Norway (2019, 18 storeys, 85.4 m; Voll Arkitekter).
    • Ascent MKE, Milwaukee (2022, 25 storeys, 86.6 m, current tallest mass-timber as of 2024).
    • Sumitomo Forestry W350 plan (Tokyo, 70-storey 350 m mass-timber tower targeted 2041).
    • Stadthaus / Murray Grove, London (2009, 9-storey, first multi-storey CLT residential).
  • Bamboo — Moso International + Bambooder + various Asian fabricators.
  • Hempcrete — Bio-based wall infill (hemp shiv + lime binder); IsoHemp Belgium, Cannabric Spain.
  • Mycelium — Ecovative Design (Albany NY; MycoComposite + Forager packaging + AirMycelium leather), MOGU Italy (acoustic + flooring), Bolt Threads + Mylo (sold to Adidas).
  • Biopolymers — PLA (NatureWorks Ingeo Nebraska + TotalEnergies Corbion), PHA (Danimer Scientific + Bluepha + RWDC Industries), cellulose nanofibre packaging (Stora Enso DuraSense + Sappi Symbio).

5. Energy efficiency + building performance

  • ISO 50001:2018 — Energy Management Systems; ~30,000 sites certified globally 2024.
  • LEED Leadership in Energy + Environmental Design — USGBC. v4.1 current; v5 launched 2024 sharpens embodied-carbon, building-electrification + climate-resilience credits.
  • BREEAM — BRE Global UK; oldest scheme (1990).
  • Living Building Challenge — International Living Future Institute; net-positive energy + water + zero-toxic-chemical materials.
  • WELL Building Standard v2 — IWBI; occupant health.
  • Passivhaus / Passive House — Wolfgang Feist 1991 Darmstadt; specific heating demand ≤ 15 kWh/m²·yr; airtightness ≤ 0.6 ACH₅₀.
  • EnerPHit — Passivhaus retrofit standard for existing buildings.
  • NZEB Net-Zero Energy Building + Net-Zero Carbon Building — different (energy in/out balanced vs lifecycle CO₂ balanced).
  • DOE Solar Decathlon — biennial; 16+ teams design + build solar-powered houses; first held 2002.

6. Sustainability frameworks + corporate disclosure

  • GRI Global Reporting Initiative — voluntary; > 10,000 reports/yr.
  • SASB Sustainability Accounting Standards Board — sector-specific; merged into IFRS Foundation 2022.
  • ISSB International Sustainability Standards Board — IFRS Foundation Frankfurt + Montreal + London (formed COP26 Glasgow Nov 2021).
    • IFRS S1 — general sustainability disclosures (Jun 2023).
    • IFRS S2 — climate-related disclosures (Jun 2023).
    • Adopted by 30+ jurisdictions through 2024 (UK, Canada, Australia, Japan, Brazil, Korea, Hong Kong, Singapore).
  • TCFD Task Force on Climate-related Financial Disclosures — established by FSB 2015; disbanded 2023 with responsibilities transferred to ISSB.
  • CDP Carbon Disclosure Project — annual climate/water/forests/biodiversity surveys; ~24,000 companies disclosing 2024.
  • CSRD Corporate Sustainability Reporting Directive — EU; in force 2023; first reports under ESRS European Sustainability Reporting Standards published 2025 for large EU companies.
  • CSDDD Corporate Sustainability Due Diligence Directive — EU adopted May 2024; supply-chain due diligence.
  • SBTi Science Based Targets initiative — joint CDP + UNGC + WRI + WWF; > 7000 companies committed by 2024; “Net-Zero Standard” 1.0 Oct 2021; corporate near-term + long-term targets aligned to 1.5 °C pathways.
  • B Corp certification — B Lab; > 9000 certified companies 2024 (Patagonia, Allbirds, Ben & Jerry’s heritage, Danone EDP).
  • SDG Sustainable Development Goals — UN 17 goals adopted Sep 2015; 2030 Agenda.

7. Water

  • Water footprint — Hoekstra + Chapagain (Twente NL 2002). Blue (surface + groundwater), green (rainwater), grey (dilution of pollution).
  • Water-Energy Nexus — desalination + irrigation + thermal-power-cooling interdependence.
  • Reuse + reclamation:
    • Singapore NEWater — 5 plants, 40 % of national water demand 2024; reverse osmosis + UV; from 2003.
    • California GWRS Groundwater Replenishment System — Orange County WD; 130 MGD = 492 ML/d, world’s largest indirect potable reuse.
    • Pure Water San Diego + Pure Water Southern California (Metropolitan Water District).
    • Israel Sorek + Hadera + Ashkelon SWRO desalination — 80 % water-resilient since 2015.
  • Desalination — SWRO Seawater Reverse Osmosis dominant; energy ~3 kWh/m³ at best plants (theoretical limit ~1 kWh/m³).
  • Stormwater management — green infrastructure (bioswales, green roofs, permeable pavement); Singapore ABC Waters; Philadelphia Green City Clean Waters; Copenhagen Cloudburst Plan.

8. Carbon accounting + offsets

  • GHG Protocol Scope 1/2/3 — Scope 1 direct, Scope 2 purchased electricity (location-based + market-based), Scope 3 indirect 15 categories (purchased goods + services, upstream + downstream).
  • Carbon offsets / removals — Verra VCS + Gold Standard + ACR + CAR registries.
  • CDR Carbon Dioxide Removal:
    • BECCS Bioenergy + CCS (Drax UK, Stockholm Exergi).
    • DAC Direct Air Capture — Climeworks Orca + Mammoth Iceland (Carbfix mineralisation), Heirloom + 1PointFive Stratos Texas, Carbon Engineering (now Occidental subsidiary), Global Thermostat. ~10,000 tCO₂/yr operational 2024 → target 1 Gt/yr 2050.
    • Enhanced rock weathering — Lithos Carbon, Eion, UNDO, Heirloom.
    • Ocean alkalinity enhancement — Planetary Technologies, Vesta.
    • Biochar — Carbofex, Pacific Biochar.
    • Concrete mineralisation — CarbonCure, Mission Zero, CarbonBuilt.
  • Net-zero vs carbon-neutral vs climate-positive definitions — SBTi Corporate Net-Zero Standard requires 90–95 % absolute emissions reductions before residual neutralisation.

9. Refrigerants + cooling decarbonisation

The Montreal Protocol (1987) phased out CFCs (ozone-depleting); the Kigali Amendment 2016 (in force Jan 2019) extends to HFCs (high-GWP). Key refrigerant transitions:

  • R-22 (HCFC; GWP 1810) — phase-out complete 2020 US developed countries.
  • R-410A (HFC blend; GWP 2088) — being replaced 2023–2025 in US residential AC.
  • R-32 (HFC; GWP 675) — Daikin’s interim path; widely deployed in Asia + Europe.
  • R-454B (Opteon XL41; HFO blend; GWP 466) — US AHRI residential default 2025+.
  • R-32 + R-454B required by US EPA AIM Act compliance.
  • R-744 (CO2; GWP 1) — supermarket refrigeration; transcritical systems (Hillphoenix, Carrier, Hussmann, Sanden).
  • R-290 (propane; GWP 3) — small commercial + heat pumps; charge limit 500 g (regulatory).
  • R-1234yf (HFO; GWP 4) + R-1234ze — automotive AC standard (Chemours Opteon YF + Honeywell Solstice yf).
  • Heat pumps vs gas — UK Future Homes Standard 2025, Germany Heat Pump Law (Gebäudeenergiegesetz GEG) Jan 2024, US IRA tax credits (25C/25D).

10. Buildings + retrofit

10.1 Decarbonisation of existing stock

US residential + commercial buildings = ~35 % of national GHG (combustion + electricity). Decarbonisation levers:

  • Envelope — air-sealing + insulation; deep retrofit standard ENERPHIT.
  • Heat pumps — air-source (Mitsubishi Hyper-Heat, Daikin Altherma, Carrier Infinity, LG Therma V) + ground-source / geothermal (Dandelion Energy NY, Bosch).
  • Electrification of cooking — induction stoves (GE Profile, Bosch).
  • Hot water — heat pump water heaters (Rheem ProTerra, A.O. Smith Voltex, Sanden CO2 HPWH).
  • Solar PV + storage — Enphase IQ8 + SunPower Maxeon + Tesla Solar Roof + Powerwall 3 + LG Chem RESU + Generac PWRcell.
  • Smart controls — Google Nest, ecobee, Sense, smart-panel Span + Lumin + Schneider Square D Energy Center.

10.2 Commercial building benchmarking

  • ENERGY STAR Portfolio Manager — US EPA + DOE.
  • CBECS (Commercial Buildings Energy Consumption Survey) — EIA.
  • NABERS (Australia) — National Australian Built Environment Rating System.
  • DEC + EPC (UK Display Energy Certificate + Energy Performance Certificate).

11. Transportation + mobility

11.1 Electric vehicles

  • Battery chemistry — NMC811 + NMC622 + LFP (Lithium Iron Phosphate, dominant for entry + storage); next-gen: LMFP (manganese-rich, CATL M3P + BYD Blade) + Si-anode + solid-state (Toyota + QuantumScape + SES + Solid Power).
  • OEM platforms — Tesla 4680 cell + structural pack, Volkswagen MEB + PPE platforms, Hyundai Motor Group E-GMP, Stellantis STLA Large + Medium + Small + Frame, GM Ultium, Ford T3 + Skunkworks, Rivian R1 + R2, Lucid LEAP.
  • Charging — NACS North American Charging Standard (Tesla → SAE J3400 2024 adoption by Ford + GM + Hyundai + Mercedes + BMW + VW + Honda + Toyota); CCS Combined Charging System (Europe + legacy NA).
  • 2024 EV transition setbacks — slowing US BEV growth, OEMs pulling back; Ford F-150 Lightning production cuts; GM Buick + Chevy EV delays. PHEV resurgence.

11.2 Maritime

  • IMO MARPOL Annex VI — sulfur cap 0.5 % m/m global (2020), 0.1 % SECA.
  • EEDI + EEXI + CII — Energy Efficiency Design + Existing Ship Index + Carbon Intensity Indicator (IMO).
  • Methanol-fuelled ships — Maersk first methanol container ship Laura Maersk 2023; A.P. Møller-Mærsk order book 25+ methanol-dual-fuel.
  • Ammonia + hydrogen + LNG — alternative fuels under evaluation.
  • Wind-assist — rotor sails (Norsepower Magnus-effect rotors deployed Maersk Pelican, Berge Bulk, Sea-Cargo).

11.3 Aviation

  • SAF Sustainable Aviation Fuel — ASTM D7566 7 approved pathways (HEFA, ATJ, FT, SIP, CHJ, etc.); blending up to 50 % with Jet A-1.
  • HEFA dominant — Neste MY SAF + World Energy + Diamond Green Diesel.
  • eSAF / PtL Power-to-Liquid — H2 + CO2 → syngas → FT → SAF. Twelve, Norsk e-Fuel, P2X Europe (Mabanaft + Sasol Air Liquide), Infinium.
  • EU ReFuelEU Aviation Regulation Oct 2023 — mandatory blending: 2 % SAF by 2025, 6 % by 2030, 20 % by 2035, 70 % by 2050.
  • CORSIA ICAO scheme — voluntary 2021–2026, mandatory 2027.
  • Electric + H2 aircraft — Eviation Alice + Heart Aerospace ES-30 + ZeroAvia + Universal Hydrogen; airbus ZEROe concept aircraft 2035.

12. Industrial process decarbonisation

  • Industrial heat ~25 % global energy + ~10 % global CO2. Pathways: electrification (resistive + heat pumps for < 200 °C, plasma + induction for high temp); H2 combustion (for furnaces; pilot ArcelorMittal + ThyssenKrupp); CCS (for chemicals + cement + power).
  • Green hydrogen — alkaline electrolysers (NEL ASA, ThyssenKrupp Nucera, Sunfire), PEM (Cummins Hydrogenics, Plug Power, Siemens Energy Silyzer, Nel Proton, Cummins-Hydrogenics HyLYZER), SOEC (Topsoe, Bloom Energy, Sunfire).
  • Carbon Capture Utilisation + Storage (CCUS) — post-combustion amines (Carbon Clean, Mitsubishi Heavy Industries KS-21, Aker Carbon Capture); oxy-fuel (Net Zero Teesside, Northern Lights); direct air capture (see §8).
  • Industrial waste heat — ORC Organic Rankine Cycle (Climeon, Calnetix Capstone, ElectraTherm), supercritical CO2 cycles.

13. Reporting + ratings landscape

  • MSCI ESG Ratings + Sustainalytics (Morningstar) + S&P Global ESG Scores + ISS ESG + Refinitiv (LSEG).
  • EcoVadis — supplier sustainability ratings.
  • CDP scores A-D (Climate, Water, Forests).
  • Science Based Targets initiative (SBTi) — net-zero corporate certification; 7000+ commitments by 2024; 5000+ validated near-term targets.
  • TPI Transition Pathway Initiative — investor-led; tracks corporate alignment with Paris.

Adjacent

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