Upon all my investigations of all TED-ED has to offer, I ran across their series, and the following are just some of their offerings--all of these have some great environmental education connections that are perfect for back to school season. I've included the number of videos in that series at the time of writing in parentheses following the series names. There are some overlaps between series.
- Ecofying Cities (10)
- Awesome Nature (220)
- You Are What You Eat (31)
- Discovering The Deep (39)
- Our Changing Climate (35)
And a fun last one--Periodic Videos, which has the periodic table as a graphic, with each element being a link to a TED-ED video.
Of course this is just a fraction of what's available over at TED-ED. For a wealth of more on a many more subjects, be sure to click their "Discover" button for both series and lessons!
Images from: "Watch - Think - Dig Deeper - Discuss" Screenshot from one of TED-ED's lessons and https://blog.ed.ted.com/2016/10/04/lead-a-ted-ed-professional-development-workshop-designed-for-teachers-by-teachers/