for the second part of his Earth Day quiz. And no matter how you grade on the quiz -- we’re not keeping score -- it’s time to collect your reward with free posters of our favorite life-filled ...

Learn about Earth Day founder Gaylord Nelson (1916–2005 ... What inspires you? Take a look at posters, buttons, stamps, and other environmental objects from our collections. Smithsonian researchers ...

This is the third Mother Earth Day celebrated within the UN Decade on Ecosystem Restoration. Ecosystems support all life on Earth. The healthier our ecosystems are, the healthier the planet - and ...