Practical Techniques for Sustainable Web Development
A pledge to build a greener internet by making digital products clean, energy-efficient, open, honest, regenerative, and resilient.
If the Internet was a country, it would be the 4th largest polluter in the world and is expected to grow considerably by 2030.
The Sustainable Web Manifesto

From the blog

Efficient audio for lower costs and great sound
If you have audio files on your website in the MP3 format, it’s worth checking whether that still is the optimal format for your content.

Practical Techniques for Sustainable Web Development
Together, we can change the internet for the better. My main mission is to empower as many as possible to build sustainable and inclusive websites. Therefore, I will gladly give a talk at your educational institutions and businesses group or meetups.
The presentation takes one hour, including questions. It has previously been held at SDU in Kolding, for design students at ZBC, at WordCamp Denmark in and WordCamp Europe in Torino, Italy.