PR stunts tend to backfire when they are hypocritical. Greta Thunberg sailed on a donated, crewed, luxury yacht to North America to avoid the CO2 emissions of air travel. But at least two (and likely 4) crew members crossed the Atlantic by air to support her effort. In her current crossing by a crewed, luxury yacht back to Europe, another crew member was flown across the Atlantic. Her travel by luxury yachts has produced significantly more CO2 than if she had simply flown herself. When this information becomes public, the climate message gets lost and viewed as hypocritical (which it is).