TED talks are a great and quick way to expand your knowledge and connect with ideas from communities across the world. It's model of collective actions and sharing of ideas is a wonderful example of social sustainability. The TED website has videos of TED talks from all around the world. This page includes a few examples which stand out but you can explore different topical playlists on their website.
https://www.ted.com/talks/greta_thunberg_the_disarming_case_to_act_right_now_on_climate_change
https://www.ted.com/talks/luisa_neubauer_why_you_should_be_a_climate_activist
https://www.ted.com/talks/natsai_audrey_chieza_fashion_has_a_pollution_problem_can_biology_fix_it
https://www.ted.com/talks/zaria_forman_drawings_that_show_the_beauty_and_fragility_of_earth
https://www.ted.com/talks/titus_kaphar_can_art_amend_history
https://www.ted.com/talks/elise_roy_when_we_design_for_disability_we_all_benefit
https://www.youtube.com/watch?v=o08ykAqLOxk
https://www.ted.com/talks/sinead_burke_why_design_should_include_everyone
https://www.youtube.com/watch?v=N3SQlrmV1cE
https://www.youtube.com/watch?v=9Ruc0Jfno2w
https://www.youtube.com/watch?v=a4n0zcsdoN0