This website is a great space to find lessons to integrate into specific content areas, with resources built around the UN's Sustainable Development Goals.
Visit belouga.org and create an account. You can attach your GSuite account to it for easier sign in.
With your content area(s) selected, you can find entire lessons that you can share with students, including videos, discussion questions or writing prompts, and class activities.
The Deep-dive series contains lessons and sessions that explore topics in greater detail, and is widely varied. From Artificial Intelligence: The Age of the Robots, to Music Throughout the Ages & How it Shaped Society, you are certain to find topics of interest to you and your classes.
These stand-alone lessons are perfect to help broaden perspectives and give students ideas for action.