Does green coding really make a difference regarding the energy consumption of software? And how can we measure that difference? To find out, we programmed a simple frontend web app in two ways: A normal and a \u201cgreen\u201d way. When we thought we were done, the real struggle began: Measuring the effect of the deployed optimization techniques. \n\nThis talk provides a very brief introduction into our quest to understand website carbon calculators.\nabout this event: https://pretalx.c3voc.de/camp2023/talk/SQTV7T/