Host your website or app with hosting services that use renewable energy, like Infomaniak in Switzerland.

Code in a way that uses fewer resources, what some call Green Coding. You could be interested in checking out also lowwwcarbon a website that tracks examples of low-carbon web design and development.

Eco-design for designers: A guide with best practices to help create digital services with a minimal environmental footprint.

Calculating Digital Emissions: A set of guidelines, questions and tools to help you calculate the carbon emissions of your digital services.

lowwwimpact: a library of articles, tools and other resources on the topic