Rivers on fire, acid rain falling from the sky, species going extinct, oil spills, polluted air, and undrinkable water: For so long, we didn't think of our planet as a place to preserve. And then, in the 1960s and 70s, that changed. Democrats and Republicans, with overwhelming public support, came together to pass a sweeping legislative agenda around environmental protection. In today's episode, what led to Earth Day, and what Earth Day led to.