Teen climate activist Greta Thunberg reacts after her Amnesty prize Sweden's teenage climate activist Greta Thunberg reacts after she was awarded a prestigious Amnesty International prize for mobilising world public opinion on the looming peril of global warming, an "amazing recognition" she said. Thunberg, a fierce campaigner with a gift for public speaking, has become a figurehead for young climate activists internationally. IMAGES AND SOUNDBITES