Now At Participating It-Must-Be-A-Burger Restaurants
             Introducing the all-new Greta ThunBurger
A unique sandwich made with psychoactive ingredients guaranteed to transform you into an overzealously officious crusader/reformer on a mission to "save the planet" and to "save other people from themselves"

She doesn't fly because "the emissions from aviation are too high".  So the Swedish teen environmentalist/crusader sails across the Atlantic in a racing boat on a two-week trip from England to the United States (and during hurricane season no less).

Exactly how was this racing boat powered?  Did she, perhaps, take all her dumps into a special onboard device that transforms biological waste into "methane power"?

I think the reason she's garnered so much attention is because of how blunt and stark she is in her demeanor.
For whatever reasons people always overreact strongly to anyone who eschews their inhibitions or are just habitually blunt and candid about their honest thoughts and feelings, especially if in an irreverent manner.