The young are going through the stages of learning. They are about to realize that adult “leaders” are foolish spoiled and immature. Adult “leaders” make excuses and do not take responsibility.
Greta has figured this out. She dismisses them with the appropriate phrase “blah blah blah.”
Leaders worldwide have failed catastrophically. The young must disobey them and, yes, take control now. This sounds like fantasy but it is doable and necessary. The current generation of “leaders” everywhere—United States, China, Russia, Brazil, India, nearly every country—(along with the generations preceding them) are unwilling or incapable of passing on a habitable Earth to the next generation.
The young can’t wait for the adults to come to their senses. They never will.