The Legacy Of One Man.
Joseph Fourier was a polymath and an adventurer who made tremendous contributions to the fields of mathematics and physics. His works of harmonic analysis and the discovery of the greenhouse effect highlighted the problem of climate change. Fourier scientific discoveries paved the way for electricity, radio, and the Internet, while at the same time, his advocacy for social reform allowed for the establishment of liberty, equality and justice. On the day of his birthday in 1994, the UNFCCC was implemented, further underscoring Fourier's remarkable achievements in the world of science. We, at DeFourier celebrate his life, his contribution and his ongoing legacy.
Joseph Fourier
David Dyan and Rayan Fetnaci
Meet the Founders
DeFourier was founded with one mission: to revolutionize the way companies grow. David & Rayan are the dynamic duo behind De Fourier – an innovative consulting agency specializing in green digital marketing and carbon footprint reduction. With over ten years of experience in the digital marketing and advertising industries, they have successfully helped green-conscious companies optimize their ROI with memorable digital campaigns. With our team of digital natives, we push the boundaries of what's possible in the current mobile-connected landscape and create award-winning campaigns.
The core values
behind our work
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Our Mission

At DeFourier, our mission is to drive ethical and regenerative growth via carbon footprint reduction, offsetting, and digital advertising for corporations around the world. We strive to make corporations carbon-negative – ultimately empowering them with a competitive edge in their sales strategy.

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Our Pledge

We, as responsible business leaders, are committed to the future of our planet and realize the importance of leading the way for sustainability, growth, and inclusion. We have a duty to reset the climate equilibrium of our planet. We are dedicated to reducing our carbon footprint, and finding effective initiatives to offset our emissions. We pledge to lead the way on this journey – not just for our own gain, but for the benefit of the entire planet.

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Our People

Founded by two French-American individuals with roots in Northern Africa, DeFourier was established to bring a fresh, modern energy to the corporate consulting industry. At DeFourier , we take our commitment to inclusivity and diversity very seriously. We believe that to truly make an impact, it is critical to have a workforce that is representative of all walks of life and all backgrounds. We are proud of our commitment to ensuring that all people can find a place to succeed in our organization.

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We will always be open and honest about our practices and the resulting impact of such practices. We place the highest priority on being transparent, striving to lead by example for the corporations and clients we serve.

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Our values center on protecting the environment and helping to create a regenerative and sustainable future. We strive to create meaningful change through consulting and developing marketing and carbon reduction strategies that will benefit both the environment and businesses.

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Our Commitments

We recognize that to promote diversity, equity, and inclusion in the workplace, we must create a culture and environment where everyone feels safe, respected, and valued. As such, we are dedicated to promoting equality, and are committed to eliminating any form of prejudice and discrimination.

The DeFourier Timeline
Joseph Fourier
The First Spark
At the climax of the first industrial, Joseph Fourier, a french mathematician and physicist, discovers the greenhouse effect.
claude pouillet
Strengthened Arguments
Joseph Fourier Argument is strengthened by french physicist Claude Pouillet.
eunice newton foote
Confirmed Arguments
Eunice Newton Foote, an american scientist and women's right activist concluded that "An atmosphere of "that gas" would give our earth a high temperature
john tyndall
Quantified Arguments
John Tyndall, an Irish physicist quantifies the CO2 Greenhouse effect.
svante arrhenius
Confirmed Theory
Svante Arrhenius theorises the Greenhouse effect in the journal of science: On the Influence of Carbonic Acid in the Air upon the Temperature of the Ground
nils ekholm
A New Term Is Born
First use of the term greenhouse by Nils Gustaf Ekholm.
hint to coal consumers
First Headline
Hint to Coal Consumers in the The Selma Morning Times about the discoveries and alerts of Svante Arrhenius “a new theory of the extinction of the human race”.
popular mechanics coal
Bomb Article
Popular Mechanics article about greenhouse effect and its impact on climate.
world war II
World Wars
Millions killed and traumatized, destroyed cities, after two world wars, europe needs to build itself back fast.
baby boom
Baby Boom
The war’s end, followed by a sustained period of economic prosperity (the 1950s and early 1960s), is accompanied by a surge in population.
time magazine 1973 the big freeze
First TIME Cover
On December 3rd 1973, TIme magazine covers "the big freeze" after record-setting cold temperatures in the winter of 1973. The first time magazine cover about climate change
carbon dioxide and climate -: a scientific assessment
Scientific Assessment
The U.S. National research council establishes a new assessment on climate change and predicts a global surface warming between 2°C and 3.5°C.
climate archive
First Ministerial Conference
The first Ministerial Conference on Atmospheric Pollution and Climatic Change in Noordwijk. The first of its kind.
tim berners internet for all
Internet For All
On April 30, 1993, the European Organization for Nuclear Research (CERN) put the web into the public domain.
first ever online ad
First Digital Ad
The first digital ad, an AT&T banner on what would become, debuted in October 27th, 1994.
first ever cop conference for the climate
First COP Conference
IPCC Second Assessment report published. The first meeting of the UNFCCC Conference of Parties (COP 1) takes place in Berlin, Germany.
kyoto protocol
Kyoto Protocol
After two years of formal negotiations, the Kyoto Protocol agreed is agreed at COP 3 in Kyoto, Japan
google creation
Google Creation
With relevant market reports and strategies at their fingertips, our media creative department will craft optimal content to your target audience just the right way, with their visuals and the right words – ensuring optimal conversion.
Linkedin Creation
The first business and employment-focused social media platform is created.
mark zuckerberg harvard facebook creation
Facebook Creation
The facebook university social media is launched by mark Zuckerberg.
youtube creation 2005
Youtube Creation
The online video platform is created and will be bought for over $1.5Bn the next year by google
first version of twitter 2006
Twitter Creation
The online social media of a new genre is launched by Jack Dorsey.
first ads on facebook
Facebook & Youtube Ads
The First Youtube Ads Facebook Ads launched with the release of the new feature for businesses.
instagram creation
Instagram Creation
The First Twitter Ads are launched. Instagram and Pinterest are created.
snapchat creation
Snapchat Creation
Snapchat is created and Sponsored stories are launched on Facebook.
first big ad campaign on facebook
First Big Facebook Campaign
Coca Cola Share a Coke Facebook Ads Campaign: (870% increase in traffic on coca cola website, 39% increase in fans on fb page) . FB Mobile ads launched.
instagram first ads
Instagram & Pinterest Ads
The First Instagram and Pinterest Ads are launched.
cop21 paris agreement
A successor agreement to the Kyoto Protocol (the ‘Paris Agreement’) is reached at COP 21 in Paris, France.
tiktok creation 2016
TikTok Creation
TikTok is created. The First bots on facebook messenger are appearing.
covid 19
Covid 19 changes everything. Hottest year on record for planet Earth.
In the middle of the Ukraine invasion, in a Post-Covid world emitting more than ever, DeFourier was born.
99% Remote & On Our Way To 100% Carbon Neutral.
We are proud to say that our agency works remotely and has no physical office. We don't need to use our clients' money to buy a shiny new coffee machine either, instead we just politely ask them for a virtual cup of joe! And on top of that it allows us to maintain a low footprint while delivering astonishing results since no one gets distracted by the air hockey table.