source: ICAO (2025) 2025 Environmental Report: Aviation and the Environment. Montreal: International Civil Aviation Organization. Available at: https://www.icao.int/environmental-protection/envrep2025
By early 2026, the transition to a Circular Economy in aerospace has moved from a theoretical “green” goal to a rigid industrial requirement. The ICAO 2025 Environmental Report and the European Aviation Environmental Report 2025 have codified this shift, establishing the first global frameworks to monitor and report CO2 emissions against the 2050 Net-Zero target. For my work at ISEC Lisboa, the most critical development is the industry’s departure from “cradle-to-gate” thinking toward a full “cradle-to-cradle” lifecycle.
The Rise of Bio-Resins and Recycled Fiber
The 2025–2026 triennium has seen a surge in the validation of bio-based resins and recycled carbon fiber (rCF) for structural applications. As noted in recent 2026 market analyses, Polymer Matrix Composites (PMC) now account for nearly 80% of the market share, with a significant push toward systems that reduce reliance on petroleum-based feedstocks.
The ICAO report highlights the urgency:
“Achieving ICAO’s global aspirational goal… will advance environmental sustainability through a basket of measures, including aircraft technology and operational improvements.” (ICAO, 2025)
This “basket of measures” now includes mandatory recycling quotas and the adoption of materials that can be recovered at an aircraft’s end-of-life. In our evaluations at ISEC, we are seeing that the most competitive Tier-1 suppliers in 2026 are those who treat recyclability as a primary design input, rather than a post-hoc mitigation.
Strategic Resilience and Supply Sovereignty
Beyond sustainability, the 2026 outlook emphasizes industrial resilience. The industry is actively diversifying its chemical dependencies to avoid single-origin resin risks. The “Best Practice” in 2026 is to design airframe architectures that are compatible with multiple, sustainably sourced resin systems, ensuring that production can remain resilient in the face of global supply chain volatility.
Conclusion: The New Certification Logic
The message for the Portuguese and global aerospace clusters is clear: certification is no longer just about safety and performance; it is about documented sustainability. As we move toward the 42nd Session of the ICAO Assembly in late 2025, the technical foundation for a net-zero sector is being laid. For the modern researcher, the goal is to ensure that the composites of tomorrow are as “circular” as they are high-performing.