Dark mode

The environmental footprint of the digital world has skyrocketed over the last few years. In the case of websites, this is caused by two factors: design and development flaws on the one hand, and poor energy management of hosting servers on the other.

To face this dual issue, France Villes et territoires Durables has chosen to entrust the management of its future web platform’s design to the digital agency Parteja, who will be responsible for developing the project in accordance with the four pillars embodying the four challenges of sustainable cities and territories, as identified by the association. This eco-design approach is both environmentally friendly and beneficial for user experience, as it improves ergonomics and performance.


  • Simple and clean development of user interfaces and design
  • Limiting the use of widgets
  • Limiting the use of energy-intensive media (videos in particular)
  • Source-code optimisation and lightening
  • Compressing media to limit their size when downloading CSS and JS scripts


The hosting of future France Villes et territoires Durables web platforms will be provided on servers managed by a company offering the following commitments:

  • Reduction and optimisation of data-center energy consumption
  • Electricity derived only from renewable energy sources
  • Use of servers not sensitive to increased temperatures and choice of air-regulation technique without cooling
  • Reuse or recycling of end-of-life servers
  • Offsetting CO2 emissions


  • Consideration of the diversity of visitors to our platforms
  • Site accessibility for people with disabilities
  • Consideration of ergonomics, access to information and the structure of data
  • Streamlining browsing processes by limiting the number of pages on which content is presented


  • Implementation of a “dark mode” design that consumes less energy than screens with light or white backgrounds
  • Setting up a cache and a CDN

About Solène

Mission Officer, Working Group, and Projects. Student at the Urban School of Sciences Po Paris, focusing on the ecological transition of cities.

About Quentin

Motivated by climate issues and planetary boundaries, Quentin decided to study land use planning at the Ecole Nationale des Ponts et Chaussées. His experience in associative field at the Fresque du Climat, helped him to better understand the stakes of the ecological bifurcation. Between his native Haute-Savoie and his home town Rennes, where he gained expertise in mobility and sustainable agriculture, he is now based in Paris to deploy the Sustainable City by France’s territorial workshops throughout the country.

About Alice

After five years’ study at Sciences Po Lyon, with a specialization in territorial transitions, Alice joined Sustainable City by France (France Villes et territoires Durables). She actively contributes to the deployment of the association’s territorial workshops and working groups.
See her LinkedIn profile 

Currently studying as a second-year Master’s student in International Relations at University Paris 1 Panthéon-Sorbonne, Tara holds a Bachelor’s degree from INALCO, with a double-major in Hindi language, and International relations / Environmental studies. Her work with us is in line with her former experiences at UNESCO and the Ministry of Europe and Foreign Affairs, thus deepening her professional expertise in the field of environmental diplomacy and international cooperation for sustainable development.

See her LinkedIn profile


She holds a Master’s degree in Development Economics from the Panthéon-Sorbonne University and is currently studying for a Master’s degree in International Relations and Action Abroad at the same university. She approaches the problems of sustainable cities and territories through these different perspectives and her international experiences.

About Isabelana

Isabelana is a Mexican journalist who holds a Master’s degree in Digital Communication and Data Analysis from the Sorbonne University. She previously worked in communication and press relations in the cultural sector in France and Mexico. Today, she is interested in ecological actions and solutions to preserve the environment and the biodiversity.

About Camille

camille photo
With a background in social sciences, art history and architecture, Camille has worked in communication within the VINCI group: from major international projects to La Fabrique de la Cité, a think tank dedicated to urban foresight.

About Alexandra

A geographer by training (Saint Petersburg State University), she started as a geographer and economist at the Academy of Agricultural Economics (Russia), before pursuing her career in France as an administrative and accounting assistant (Air Liquide, Association TGV Provence Côte d’Azur, COFHUAT, Groupe Hervé)

About Marion

Trained in international and European affairs between England and France as part of a double degree at Sciences-Po Lille / University of Kent, Marion started her career in advocacy and institutional relations of non-governmental organisations, in the fair trade sector (Max Havelaar France label). Her experiences are also linked to territories, with a passage in decentralised cooperation at the level of a departmental council.

About Sébastien

Before joining the SCbF team, he held several positions in local government management. From elected official and deputy mayor of his native city Besançon, in charge of university relations and international cooperation, to Director of Economic Development of the City of Pantin, to Chief of staff in Montreuil – where he notably piloted the in-depth redesign of the urban project towards more ecology and sustainable development – he continued his career as Senior Resilience Officer of the City of Paris.
He promotes a holistic and systemic vision of sustainable development and brings his expertise in territorial resilience, ecological and social transition.