Regarding the zeitgeisty mumbo jumbo surrounding a 16-year-old girl from Sweden named Greta Thunberg, it's always good to remember the past and bring it upon the table: There have been other environmental activists before, acting even more fierce than her and following a recognizable agenda instead of a plain social media hype that still lacks content after months.
One of these people was a Swiss man named Bruno Manser.

(Thanks to a person I only got to know under the nickname "Sanni" for once teaching me about him.)