May you volunteer a couple of hours afterwork in your week to some environmental charity at local or regional level? As a STEM professional very able with computers, your skills might help a lot without touching hard-nosed activism or politics.
This so much.
Something like setting up mailchimp for a nonprofit, setting up a crm system to track volunteer data, how to read google analytics for their webpage, or even as simple as getting email signatures setup for the office workers. I've spent a lot of time proving basic IT support and basic "this is how you effiently use a email" types of deals.