FAQs

We help organisations make jet fuel and SAF decisions they can defend. Our Signals give an independent, evidence-backed view of a decision, with the reasoning, the range and the developments that would change it. Alongside this, we run a research programme testing whether jet fuel, tuned at production, can cut contrail warming.

SAF plant developers, jet fuel buyers and suppliers, obligated suppliers and airlines, fuel producers and refiners, lenders and funds, infrastructure and technology suppliers, and governments and regulators.

Bristol, in the United Kingdom, a city with a long aviation heritage. We work with clients and partners internationally.

A Signal is an independent assessment tailored to the question you have to answer: a verdict with its reasoning, a central view with its range, the signposts that would change it, and graded sources and stated assumptions. It is prepared so you can share it with your board, lenders, regulator or counterparties.

A market report describes the market. A Signal answers your question, in your market, at your decision point, and tells you how reliable the information behind it is, including ours.

We apply the same views and methods to every client, and we decline work that would compromise our independence. That way you and your counterparties work from the same basis.

Yes. Your information is used only for your work, and every engagement sits within a mutual non-disclosure agreement.

Tell us the question you are weighing, who the answer is for and when you need it. Email action@circulairity.co and we will agree the scope with you before any work begins.

Not much. Burning SAF releases about the same CO₂ as fossil jet fuel. Its benefit comes from the rest of the value chain: where the carbon came from, and the energy and hydrogen used to make it. That is why savings vary widely between pathways.

Aviation warms the climate through CO₂ and through shorter-lived effects, most of all contrails. We report in tCO₂e, the unit regulators use, and in tCO₂-WE, which shows how much warming is actually avoided.

Contrail cirrus is the largest single part of aviation’s warming. Most of it comes from a small share of flights: 80% of contrail warming is caused by 2% of flights.

No. We see it working alongside SAF, not instead of it: SAF for carbon, tuned fuel for contrails, together for warming.

A programme testing whether a specification-compliant jet fuel, tuned at production, can cut soot and contrail ice, and so contrail warming. It works for SAF and fossil jet fuel, and with today’s aircraft, engines and airport infrastructure.

Download the contrail research briefing from our Resources page, or email partner@circulairity.co.