Greta got into an unfortunate twitter war with the German railway system.

Greta tweeted a pic of herself sitting on the floor with her bags, and complained that the German railway systems were so crowded she couldn't get a seat.
The railway apologized profusely and said they supported Greta and her battle against CO2 emissions.
Then it came out that the railway had actually put Greta in a first class seat, along with the rest of her party soon after this picture was taken. The railway then said Greta should've mentioned this fact and the kind actions of the train staff in moving her to first class, and they took back their apology.
Then Greta tweeted it was GOOD that the train system was overcrowded because it showed people were taking the train.
I have to say that Greta hasn't experienced overcrowding until she's been on an Italian train on a busy day. On a jam-packed full Italian train people and their bags would be wedged in together everywhere until everyone was forced to stand up, pressed up against everyone else...in the aisles, on the steps, between cars and into the toilet rooms. And then off you go for three hours packed in like sardines, with your chin pressed into somebody's grandmother's hair and your back pushed up against what you fear is a professional Italian pickpocket as the train bounces along.
Of course, Greta is actually just a teenager, and she is usually so composed and articulate it seems surprising when she acts like typical whiny teenager.
CHEERS!