International Sustainability and Carbon Certification CORSIA

As the aviation industry intensifies its efforts to reduce climate impact, sustainability and carbon accountability have become critical priorities. Airlines are now required not only to improve fuel efficiency, but also to demonstrate measurable reductions in greenhouse gas (GHG) emissions through the use of sustainable aviation fuels (SAF).

This is where ISCC CORSIA (International Sustainability and Carbon Certification – CORSIA) plays a vital role.

ISCC CORSIA is a globally recognised sustainability certification system developed to support the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA), a global market-based mechanism established by the International Civil Aviation Organization (ICAO) to address CO₂ emissions from international aviation.

ISCC CORSIA is a certification scheme recognised under ICAO’s CORSIA framework. It provides a robust system to verify that sustainable aviation fuels (SAF) and eligible feedstocks meet strict sustainability and lifecycle greenhouse gas (GHG) requirements.

ISCC CORSIA applies to the entire aviation fuel supply chain, including:

• Feedstock producers

• Biofuel and SAF producers

• Traders and logistics operators

• Airlines and fuel suppliers

The certification ensures that fuels supplied to airlines under CORSIA are sustainably sourced, fully traceable, and deliver real GHG emission reductions compared to conventional fossil jet fuel.

ISCC CORSIA is built around core sustainability and climate criteria defined by ICAO, including:

Sustainability Criteria

• No conversion of land with high biodiversity value

• No use of land with high carbon stock

• Protection of natural ecosystems

• Compliance with social and labor standards

Traceability and Chain of Custody

• Full traceability of feedstocks and fuels

• Mass balance system across the supply chain

• Prevention of double counting and fraud

Lifecycle GHG Emissions

• Calculation of lifecycle greenhouse gas emissions

• Demonstration of minimum GHG savings compared to fossil jet fuel

• Transparent and verifiable carbon accounting

Regulatory Compliance

• Alignment with ICAO CORSIA sustainability criteria

• Compliance with international aviation sustainability requirements

These elements ensure that SAF supplied under CORSIA contributes meaningfully to aviation decarbonisation.

At Green Sustainability Resources Sdn. Bhd. (GSR), our ISCC CORSIA consultancy approach focuses on building technically sound, compliant, and audit-ready sustainability systems for aviation fuel supply chains.

1. Aviation Supply Chain-Based Approach

We develop ISCC CORSIA systems based on:

• Actual fuel supply chain structure

• Type of feedstocks and fuels

• Operational roles (producer, trader, storage, airline, etc.)

This ensures the system reflects real aviation fuel flows, not theoretical models.

2. Technical Expertise in CORSIA and GHG

Our consultants bring hands-on experience in:

• ICAO CORSIA sustainability requirements

• ISCC system documents

• Lifecycle GHG calculation methodologies

• Mass balance and traceability systems

This allows us to translate complex aviation climate requirements into practical operational systems.

3. Focus on Audit-Ready Systems

We design ISCC CORSIA systems that are:

• Fully traceable and well-documented

• Supported by structured procedures and records

• Aligned with ISCC audit expectations

• Prepared for initial and surveillance audits

Our objective is to ensure clients are technically compliant and operationally confident.

4. End-to-End Support

Our ISCC CORSIA consultancy services include:

• Initial gap analysis

• Supply chain mapping and scope definition

• Development of ISCC CORSIA documentation

• Lifecycle GHG calculation support

• Mass balance system setup

• Internal audit preparation

• On-site support during certification audits

Clients receive full technical guidance throughout the certification journey.