If you’re curious about how software can contribute to mitigating climate change (with or without working directly in climate tech), The Linux Foundation has a free course that gives a straightforward introduction to the topic that can be finished within a few hours.
Climate change mitigation is a complicated subject (to say the least), and the course introduces a whole slew of acronyms and terminology that one must know to be literate in the space. I don’t have an outstanding memory myself, so I’ve made an Anki deck out of my notes. You can download it here.
For more info about green software, check out these resources: