I created an app for sharing checklists and I then used this app to create a step-by-step guide for a process for finding work as a dev fighting climate change: https://voice.ch.ckl.st/how-i-am-fighting-climate-change-as-a-software-developer/
I've been writing code to feedback to electricity consumer's in Texas the degree to which renewables are present on the grid. Little things like setting the dishwasher to delay operation until peak wind % time, helps. In Texas, this time falls between 1-4AM, depending on the weather.