Greta Thunberg is an 18-year-old climate activist from Sweden who began organizing school strikes in 2018 to bring attention to the climate crisis. Her speech at the 2019 UN Climate Action Summit criticized world leaders for their inaction. She travels by boat to reduce her carbon footprint and is vegan. The BBC's Planet Earth documentary series, which began airing in 2006, has brought stunning footage of remote natural areas to wide audiences, especially among those aged 16-34. The popularity of the series demonstrates its ability to engage the target demographic on issues of nature and the environment.