So basically she caused far more emissions with all the accompanying people flying back and forth.
Via Daily Mail:
A British yacht skipper’s flight to the US to help Greta Thunberg sail to Portugal has produced the same amount of carbon emissions the voyage hoped to save.
Nikki Henderson, 26, flew to the US from Britain to sail 48-foot catamaran the La Vagabonde.
The vessel is carrying Miss Thunberg and her father Svante 3,000 miles to Portugal where she will go onto attend the COP 25 climate change talks in Madrid.