Green claims are cheap. Proof is what convinces.

Sustainability marketing agency

Every company is sustainable now — on their website. Which is exactly why the readers who matter stopped believing websites: investors check the numbers, engineers check the technology, procurement checks the certifications. Marsmedia is a sustainability marketing agency from Amsterdam, working for greentech companies in the US, the UK and Europe — building brands and websites that convince through evidence, not adjectives.

Twenty years and more than three hundred websites, a substantial share for organisations working on tomorrow’s world: renewable energy, cleantech, circular technology and the innovations beyond.

For the investor who scans before the round, the customer who compares before the pilot, and the engineer who checks whether you actually know your own technology.

4.9 average on Google, 44+ reviews

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Sustainability marketing agency — Marsmedia work for greentech companies
Sustainability marketing agency — Marsmedia work for greentech companies
Sustainability marketing agency — Marsmedia work for greentech companies
Sustainability marketing agency — Marsmedia work for greentech companies
Sustainability marketing agency — Marsmedia work for greentech companies
Sustainability marketing agency — Marsmedia work for greentech companies
Mars team reviewing brand color swatches and website mockups during a design meeting
Mars team reviewing brand color swatches and website mockups during a design meeting
Mars team reviewing brand color swatches and website mockups during a design meeting
Mars team reviewing brand color swatches and website mockups during a design meeting

Why greentech communication is different

Generic marketing breaks on greentech. Four reasons this work asks for a partner who knows the field.

Talk through your situation →

4.9 average on Google, 44+ reviews

logo solventa
Avantium logo
logo pyxis
Avantium RDS logo
logo refuels
logo brachyacademy
logo brachytherapy
logo azerion
logo companyinfo
logo fsa
logo lms
logo scribe
Confo logo
logo abvion
Performation logo
logo jii
logo waste
logo billygrace
Cabometyx logo
logo stampa
logo redevco
logo vua
logo adgoji
logo e-storage

Sustainability marketing: what we do, specifically

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Greentech web design

Websites that explain complex technology without flattening it: structure for the scanning investor, depth for the verifying engineer, and a business case the customer can retell internally. Designed and built by one team, so what you approve is what goes live.

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Sustainable branding

As a sustainable branding agency we design identities that look credible to an investor and honest to an engineer, at the same time. Logo, typography, colour and tone as one system — documented in guidelines your team can work with.

No leaf clichés, no gradient greenwash. A brand that holds because the substance underneath does.

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Renewable energy and cleantech marketing strategy

Which audiences matter this phase — investors, offtakers, pilot customers, policy — what does each need to believe, and which channels reach them? Renewable energy marketing and cleantech marketing share one rule: the strategy comes before the deliverables, so the work adds up instead of piling up.

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Content that carries proof

Case studies with numbers, technology explainers a non-engineer can follow, insight pieces that show how you think. Written with your technical people, not around them — the precision stays in, the jargon goes out.

In a field where trust is the currency, content either earns it or spends it.

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Greentech SEO

Being found when an investor, partner or customer searches your field. Technically sound pages, content matched to real search behaviour, and authority that compounds in a niche.

Measured and reported on what actually happens — positions, impressions, enquiries.

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Findable in AI answers

Investors and buyers increasingly ask ChatGPT, Claude and Perplexity before they ask you. We structure content so those systems can read and cite it correctly — and we set up the measurement.

Marsmedia — greentech marketing work in progress

“In greentech, trust is the currency.
Marketing that overclaims spends it.”

— Marsmedia

Nelson Eggermont, design and UX specialist at Mars

What working with us looks like

“Mars had a quick understanding of our industry needs”

“With Mars, we felt supported from start to finish. Their quick understanding of our industry’s needs and proactive approach kept the project on track, ensuring both websites launched right on time.”

Stanislava | Communications Officer at Avantium

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Smiling man with glasses, a friendly Mars team member

Working on something the world should understand? Let’s talk — we’ll keep up.

How we work

Three steps. Everyone knows what is needed, and when.

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We listen, at level

The kickoff runs two to three hours, founder included — with your engineers at the table. We come in understanding pilots, scale-up economics and certification, so the conversation starts at the substance, not the glossary.

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We find the difference

Competing companies in this field claim the same impact. We keep asking until the real differentiator surfaces — then build the story, structure and site around exactly that.

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We stay through the scale-up

The story changes from pilot to commercial scale. We stay involved as it does — 90% of our clients continue after the first project, which in this sector is the whole point.

Frequently asked questions