At first, Thunberg’s father reassured her that everything would be O.K., but as he read more about the climate crisis, he found his own words rang hollow. “I realized that she was right and I was wrong, and I had been wrong all my life,” Svante told TIME in a quiet moment after arriving in Lisbon. In an effort to comfort their daughter, the family began changing their habits to reduce their emissions. They mostly stopped eating meat, installed solar panels, began growing their own vegetables and eventually gave up flying—a sacrifice for Thunberg’s mother, who performs throughout Europe. “We did all these things, basically, not really to save the climate, we didn’t care much about that initially,” says Svante. “We did it to make her happy and to get her back to life.” Slowly, Thunberg began to eat and talk again.