Environmental impact consultancy / Amsterdam

Environmental claims and impact assessments.

I help businesses review environmental claims against the available evidence and relevant EU and national requirements, and prepare impact estimates for customers, partners and funders.

Discuss your project View case studies

Work directly with Çağla Karslı.MSc Environmental Science, Boğaziçi University
Co-founder of two climate startups · Based in Amsterdam

Client work

Case studies

These two projects show how I work with founders. Each case study explains the assessment, its sources and what the result includes.

Polpette di Pane

What the client neededAn impact estimate for pilot partners and funders.

What I assessedI modelled the emissions avoided by rescuing surplus bread, combining life-cycle data with evidence on the food it replaces and its likely disposal.

A decision in the assessmentCargobike deliveries and oil recycling were excluded: no van journeys were displaced, and the oil would already have been recycled.

What the client receivedA screening-level estimate with its sources, assumptions and exclusions documented.

How the estimate was built

Data sources. ADEME production data, peer-reviewed substitution research and CE Delft waste-treatment data.

Model choices. Checked whether the bread would otherwise become waste and what food its reuse replaces.

Cross-check. Compared the estimate with published research on surplus-food recovery.

Read the full case study

0.59

kg CO₂e saved per kg of surplus bread

Screening-level estimate

Circular fashionAmsterdam

The Swap Club

What the client neededImpact figures for accelerator applications and investor discussions.

What I assessedI worked with the founder to model 16 clothing categories, combining category-specific life-cycle data with a conservative estimate of the new purchases displaced.

A decision in the assessmentWithout a platform-specific user survey, I applied the lowest replacement rate in the research reviewed: 29% of swaps displacing a new purchase.

What the client receivedAn avoided-emissions estimate with a documented replacement assumption and clear boundaries.

What does the result include?

The model uses category-specific emission factors from ADEME, Carbonfact and published life-cycle studies. I cross-checked the results against peer-reviewed research.

Logistics and venue emissions have not been deducted. The figure shows avoided production emissions, rather than the platform’s net footprint.

Read the full case study

4.89

kg CO₂e avoided per swap

Gross avoided emissions

Services

Claims, assessments and workshops

Start with the question your business needs to answer. I can review an existing environmental claim, assess an activity or work with the founders in your programme.

You need to review a claim against EU or national requirements.
A customer or partner has asked for supporting evidence.
You need impact figures for an investor or funding application.

For businesses

Environmental claims review

I review a claim alongside its supporting evidence, scope and comparisons. I identify gaps in the data and wording that may overstate the environmental benefit.

What can we review?

Environmental statements on your website, product pages or marketing materials. We agree on the claims, market and communication channels to include before work begins.

What the review gives youYou can use the findings to revise or remove unsupported claims, collect missing evidence and decide whether specialist legal review is needed.

Technical evidence review. Legal opinions and certification are outside this service.

Discuss a claims review ↗

For founders

Impact assessment

I estimate the emissions your activity could avoid compared with what would happen without it. This is a screening-level assessment, rather than a full life-cycle assessment.

Is this right for my project?

If an investor, partner or accelerator has asked about your environmental impact, we can look at what you need to measure and the data you already have.

What you receiveAn impact estimate with its sources, calculations, assumptions and limitations documented, so you can explain how the result was reached.
Discuss an assessment ↗

For programmes

Impact workshops

I work through food and fashion case studies with founders so they can learn how to build an impact estimate.

What does a workshop cover?

We look at the data needed, what to compare an activity with, and how assumptions change the result.

For accelerators and startup programmesHelp your founders understand what an impact assessment involves, what evidence it needs and where to start.
Discuss a workshop ↗

Claims & regulation

Review the evidence before you publish.

EU consumer rules address vague and misleading environmental claims. Directive (EU) 2024/825 has applied since 27 September 2026. National requirements and sector-specific rules also need to be considered. Misleading claims can lead to complaints and enforcement action.

I help you examine the evidence behind a claim and identify where it needs to be more specific or better supported. The rules that apply depend on the market, product and how the claim is used.

EU consumer rules ↗Dutch ACM guidance ↗

ACM’s guidance includes its 2023 guidelines and an update on the 2026 rules. Guidance should be read alongside current law.

Partners

Trellis Guide

Trellis Guide helps climate and impact entrepreneurs move from ideation to building with confidence. Get the clarity, validation, and roadmap you need to turn your vision into reality.

Their business and technical support sits alongside my work on environmental impact assessments.

Meet Trellis Guide ↗

The process

How we work together

We agree on the question, the information available and the scope of work before the analysis begins.

01 / Scope

Understand your activity and question

You explain how your business operates and what you need the findings for. We review the information you already have and agree on the work to include.

02 / Analysis

Review the evidence

I check sources, comparisons and assumptions, and identify missing data. For an impact assessment, I build and check the estimate.

03 / Findings

Document and discuss the result

You receive the findings with their sources, assumptions and limitations. We discuss what they support and where more evidence is needed.

The case studies above are screening-level assessments, not certified life-cycle assessments. Sources include ADEME, CE Delft and peer-reviewed research. Each case study explains the assumptions and limitations.

About me

I’m Çağla Karslı.

I’m an environmental scientist and climate-tech founder based in Amsterdam. I hold an MSc in Environmental Science from Boğaziçi University and co-founded Katık, a smart waste platform, and Carboff, a carbon marketplace.

I work with businesses and circular startups on the evidence behind environmental claims and impact estimates. We go through the assumptions together, so you understand what the findings support.

More about me

“With real numbers, my startup sparks real interest from investors and clients, because I can finally show what I’m actually achieving.”

Maria Daniela ColagrandeFounder, Polpette di Pane

“She showed me the assumptions behind each logic and we chose to go with the most conservative method.”

Gökçe IliklierFounder, The Swap Club

Discuss your claims or impact assessment.

On the introductory call, we’ll discuss your question, the information you already have and whether my approach fits your project.

Prefer email? support@carbonsquare.earth

Book a call