2020 marks the 50th anniversary of Earth Day -- a momentous occasion. This year's theme is Climate Action because "climate change represents the biggest challenge to the future of humanity and the life-support systems that make our world habitable." We've compiled a list of nonfiction books for intermediate readers that celebrate our planet, educate about the crises it faces, and offer age-appropriate models for environmental activism. See also our booklists for primary and older readers.