Tim DeChristopher
Tim DeChristopher.

Earth Day, oddly, has never been a huge deal for me. I’m just a little too young to really remember its remarkable debut in 1970, when one American in 10 went out in the streets to demand action on clean air and water. That unprecedented activism laid the groundwork for the swift passage of legislation, and the almost-as-swift rehabilitation of lakes and rivers. But in the years after, many Earth Day celebrations drifted in a slightly more corporate direction; there wasn’t anything wrong with them, but they didn’t seem to be helping arrest environmentalism’s slide into relative impotence.

This year, however, the holiday really resonates, because there are two heroes reminding us of the sacrifices they’ve made to move the fight forward, and the way the rest of us need to step up our game.