[UPDATE, Read more...]
Public Domain (CC0) poster available in print size at http://everythingneedstochange.today/greta-thunberg-the-rebellion-has-begun
Follow the link to read the speech she gave or get the HD file for print.
[UPDATE1] "Art, Propaganda and Heteronomy" https://artstation.com/wootha/blog/oO7B
[UPDATE2] "Art, Reality, Imagination and the Future" https://www.artstation.com/wootha/blog/AonW