If you are a grown adult who has spent countless hours over the last week fuming about, gossiping about, and defaming a 16 year old girl, it is time for some self-reflection on your part.
She is not a scientist, and is not required to provide expert scientific testimony.
She wisely leaves the science to the subject matter experts - who based on four decades of research overwhelmingly have concluded that Greta's generation faces serious climate challenges if we adopt a do-nothing attitude.
She is advocating action and awareness on the part of decision makers and the global community.
I find some of her language a tad hyperbolic, but everyone here remembers what it was like to be a teenager - some us were full of passion, unrestrained animation, and exuberance, and we had not yet learned the adult skill of temperance and restraint.
Come to think of it, there are posters here who still have not learned the adult skills of temperance and restraint.