You can add #SustainableSoftware to the list of hashtags 😍
"First Ever Eco-Certified Computer Program: KDE's Popular PDF Reader Okular"
https://eco.kde.org/blog/2022-03-16-press-release-okular-blue-angel/
If you are curious to learn more about Blue Angel eco-certification and how it applies to Free Software, check out the #KDEEco handbook: