What has little Greta done to advance the cause of world peace? Has she convinced Palestinians to abandon terrorism and start behaving like civilized neighbors? Has she convinced Kim Il Jong to give up nukes and open his country to normal relations with the rest of the world? Has she convinced China to give up on its ambitions of hegemony?
No?
Then she does not deserve a prize. All she did was act out a script on a topic she has no understanding of.
Not like there are any memorial pancake breakfasts in her name.