This week, environmentalism was in the spotlight, thanks to the 50th anniversary of Earth Day. Over the decades, environmentalism has adapted to new challenges, like increasing levels of greenhouse gases and a swinging pendulum when it comes to federal policy. But the 1980s exemplified a notable and often consequential shift in how people - from protestors to the president - approached environmental issues. So on this episode of BackStory, Ed and Brian dig into the 1980s and explore how actions in both federal policy and grassroots movements shaped environmentalism.