"How dare you?" Thunberg was heard admonishing a driver during a test run. "I have offered you an opportunity to atone for your sins against our great planet and turn away from the evil you and your fellow humans have wrought in our environment, yet you refuse. You have ravaged the earth and stolen my dreams and my childhood. Turn left here."

One driver who tested out the system wholeheartedly vouched for its belligerence. "I really did feel ashamed of myself," he said. "After choosing not to take the more eco-friendly route, I spent the next 10 minutes being berated by the voice of Greta Thunberg herself. It felt like she was sitting in the car with me making me feel awful about my choices. It's the most self-righteous GPS I've ever used."