Greta is not an authority on climate change, but the climate scientists are. Greta is carrying and publicizing the climate scientists' message. They are not very good at public affairs. Greta has already addressed the United Nations COP24 Climate Summit, the United Kingdom Parliament, the European Union Parliament, the French Parliament and French President Macron, the Italian Senate, the Austrian R20 2019 World Summit, and she's scheduled to address the United Nations Climate Action Summit in NYC on Sept 23, and the United Nations COP25 Climate Summit in Chile in December. She has also given numerous interviews on mainstream media like CBS, the Intercept, Democracy Now!, Good Morning Britain, The Daily Show with Trevor Noah, and many more. The media knows she's the real deal.