SUSTAINABILITY REPORT 2025
2025 is a wrap and we look back on our transformation throughout this last year. Take a look through it with us.
EXPERT-LED, SCIENCE-DRIVEN, IMPACT-FOCUSED
A MESSAGE FROM TUNLEY’S CEO
If 2024 was the year Tunley Environmental found its stride, then 2025 appears determined to test how fast we can run. Fortunately, after watching me attempt 52 marathons in a year (more on that later), the team now knows that “comfortable pace” is not really part of my vocabulary.
We’ve grown again; in people, in expertise and in the number of times we’ve collectively uttered the phrase “yes, that sustainability regulation has changed…again.” This year, we’ve had to navigate the ever-expanding alphabet soup of regulations (CBAM, SBTN, CSDDD, CSRD, ESRS, TNFD, take your pick), helping clients uncover carbon reductions they didn’t know were possible, alongside navigating biodiversity enhancements. I can truly say our amazing scientists and wider team members have delivered outstanding work across regions, sectors and settings.
Of course, the wider context remains serious. Climate impacts are intensifying, biodiversity loss continues to challenge ecosystems around the world and supply chains are under greater scrutiny than ever. The transition to a more sustainable and resilient global economy requires consistent effort and honest collaboration. But I believe our work this year, and the progress we see across our client community, gives us real cause for optimism.
As we look ahead to 2026, new frameworks, new reporting obligations and new expectations will come into play. We will continue to support organisations through these developments, turning complex sustainability challenges into practical, science-based solutions that help our clients move forward with confidence.
Thank you to our clients, partners and the entire Tunley team for your hard work and commitment throughout the year. I’m excited to see what we will achieve together next.
Dr William Beer CEO | Tunley Environmental
OUR YEAR IN REVIEW
2025 has been a year of both advancement and reckoning for sustainability. While key regulatory reforms and maturing climate frameworks signalled a firmer global commitment to environmental action, geopolitical instability, tightening disclosure requirements, and persistent gaps in global emissions reductions highlighted the scale of work still to be done. Businesses made progress in integrating sustainability into strategy, yet many continued to grapple with evolving compliance obligations, supply-chain exposures, and the practical realities of transitioning to low-carbon operations. Scientific innovation accelerated, offering new mechanisms for addressing climate, biodiversity and water impacts, but adoption varied widely across sectors.
In Tunley Environmental’s 2025 Sustainability Report, we explore these dynamics in depth, examining how regulatory milestones, technological developments, changing market expectations and emerging climate assessments collectively shaped a complex and defining year.
Employees
which 9 PhD-Level Scientists
5754 Followers
11,883 Followers New Case Studies
227 Publications
INDUSTRIES AND PUBLICATIONS
INDUSTRIES
AIRPORTS
ARCHITECTS & DEVELOPERS
CHEMICALS, COATINGS & CLEANING
CONSTRUCTION
FOOD INDUSTRIES
MANUFACTURING
MINING, METALS AND STEEL
OIL & GAS
PHARMACEUTICAL & MEDICAL DEVICES
PORTS & MARITIME
TRANSPORT & LOGISTICS
UNIVERSITIES
MARINE WILDLIFE
SUSTAINABILITY
BUSINESS
MARITIME
ECOLOGY
ARCHITECTURE
BUILDING & CONSTRUCTION
ENGINEERING & MANUFACTURING
PACKAGING
FOOD
TECHNOLOGY
WATER
ENERGY
LOGISTICS
CONCRETE & CEMENT
TRAINING
PHARMACEUTICAL & HEALTHCARE
PROCUREMENT
PROPOSED CARBON EMISSIONS REDUCTION
In 2025, our projected carbon emissions reductions reached a new milestone. This year, we achieved a proposed reduction of 391,324 tCO₂e per year, which is equivalent to the weight of 2,795 Blue Whales. This demonstrates a significant increase in proposed carbon reductions this year, increasing by 150,045 tCO2e/year and highlights the expanding scale and impact of the decarbonisation work we deliver across our client projects.
OUR ENHANCED BIODIVERSITY
Our biodiversity impact has grown considerably in 2025. This year, on-site developments delivered a total net gain of 113.896 habitats, equivalent to 284,740 m2 of modified grassland or 39.88 football pitches of ecological uplift. This marks a substantial rise from our Q4 2024 results, which delivered 26.133 habitats, 65,332 m2 of modified grassland and 9.15 football pitches. The increase reflects both the rising integration of biodiversity into development planning and the expanding impact of our specialist BNG services.
