And so this is Earth Day! But what have you done? Earth Day may just come and go just like any other. To find out how Earth Day’s political impact has held up in the real world for 38 years, I visited Saint Simon Stock Elementary School in New York City. What’s special about this school is that it doubles as a field lab for leading climatologists to study the benefits a “green roof” installed in 2005. From places like this, it’s clear that Earth Day hasn’t just come and gone for the researchers and kids but resonates every day, building in momentum, learning, and understanding.