World Beyond War (WBW) is offering an online, self-paced course on the realationship between 2 existential threats: war and environmental catastrophe, culminating in an emphasis on “what can be done”. You can register for the course here: https://worldbeyondwar.org/war-and-the-environment-april-10-may-22-2023-online-course-registration/ .
Check the https://worldbeyondwar.org/ site to see other education & action opportunities.