We build the operating system behind sustainability work

DEISO is a Tokyo-based sustainability systems company. We help organizations execute, review, and manage LCA, GHG accounting, PCF, EPD, ESG, and AI-supported sustainability work.

We build the structure behind sustainability work: data workflows, calculation systems, technical review steps, evidence files, reporting logic, and decision-support processes. This helps companies move from scattered sustainability tasks to a managed operating system.

Our work combines technical execution, independent review, verification readiness, and implementation-focused capacity building. The result is sustainability work that is easier to manage, easier to verify, and ready for reporting, decisions, and verification.

DEISO has supported clients across 35+ countries, working as a technical partner where accuracy, reliability, and verification readiness matter.

Who we are

DEISO stands for Integrated Environmental Sustainability Oriented Research and Development. Our mission is simple:

To make sustainability work organized, measurable, and ready for real-world decisions.

We work at the intersection of environmental science, sustainability data, technical modeling, workflow design, and AI-supported sustainability systems.

DEISO is not only an advisory company. We take responsibility for the technical work behind sustainability outcomes: preparing data, building models, reviewing results, identifying gaps, correcting issues, and helping teams use the system after delivery.

What we deliver

DEISO delivers sustainability operating systems and technical execution for organizations that need reliable, verification-ready results.

Core delivery areas

• Life Cycle Assessment (LCA) modeling, review, and improvement
• Scope 1, Scope 2, and Scope 3 GHG accounting systems
• Product Carbon Footprint (PCF) development and review
• Environmental Product Declaration (EPD) readiness and preparation support
• ESG data workflows, evidence systems, and reporting support
• Pre-submission technical review before verification or reporting
• Sustainability data architecture and internal governance workflows
• AI-supported decision-support systems for sustainability work
• Implementation-focused capacity building for internal teams

When companies work with DEISO

• Internal teams need stronger structure, technical support, or review capacity
• Sustainability data is scattered across departments, suppliers, files, and tools
• LCA, GHG, PCF, EPD, or ESG work needs to be prepared for verification or reporting
• Data quality, calculation logic, or methodology consistency is uncertain
• A regulatory, customer, or procurement requirement is approaching
• The organization needs a repeatable system instead of one-time sustainability work

In these situations, DEISO helps diagnose the gaps, organize the data, execute the technical work, review the outputs, and stabilize the operating system behind the sustainability function.

Advanced sustainability system capabilities

• Scope 3 category-level modeling and supplier data validation
• EPD dataset structuring aligned with EN 15804 and PCR requirements
• Comparative LCA and decision-support environmental modeling
• Industrial carbon readiness and exposure diagnostics
• AI-supported sustainability data architecture and workflow design
• Internal evidence systems for verification readiness and technical review
• Capacity building linked directly to delivered systems, workflows, and methods
• Regulatory alignment across international sustainability frameworks

How we work

• Assess — we review the data, methods, models, documents, workflows, and current risks.
• Structure — we organize the sustainability data, responsibilities, calculation logic, and evidence flow.
• Execute — we build or improve the LCA, GHG, PCF, EPD, ESG, or AI-supported sustainability work.
• Review — we check consistency, assumptions, documentation, methodology, and verification readiness.
• Support — we help internal teams understand and operate the system through implementation-focused capacity building.

The goal is not only to finish one project. The goal is to leave the organization with a clearer, stronger, and more repeatable sustainability operating system.

How DEISO turns sustainability data into decisions

DEISO turns data, models, evidence, and workflows into outputs that teams can use.

• Data is organized and checked for consistency
• Models and calculations are reviewed for technical reliability
• Evidence is structured for verification readiness and technical review
• Results are translated into clear technical and business decisions
• AI-supported systems support analysis, interpretation, and workflow efficiency

DEISO combines expert-led execution, structured data architecture, and AI-supported analysis to make sustainability work more reliable, manageable, and decision-ready.

Why DEISO

• We build systems, not scattered outputs
• We execute the technical work, not only advise on it
• We support LCA, GHG, PCF, EPD, ESG, and AI-supported sustainability work
• We prepare sustainability work for verification readiness, technical review, and reporting
• We combine technical review with practical implementation support
• We help internal teams build capacity around the delivered operating system
• We bring global delivery experience across 35+ countries

At DEISO, we help organizations build the operating system behind sustainability work: the data, workflows, technical review, evidence, and capacity needed to make sustainability reliable and ready for action.