Swedish teenager Greta Thunberg’s shaming of world leaders and air travelers over climate change has won her millions of supporters. She has also gained many new followers to her cause. But it just might cost her the Nobel Peace Prize. Thunberg is one of only a few people whose nomination has become known before the Nobel ceremony. Prize experts consider her to be the favorite to win the award this year. At 16, she would be the youngest recipient of the award. She would also be the first to win the prize for environmental work since Al Gore. The former American vice president shared the prize in 2007 for spreading knowledge of climate change. But Thunberg’s youth, directness and resolve among the causes of her popularity could be seen as problems for the Norwegian Nobel Committee.