Grist: Earth Day, oddly, has never been a huge deal for me. Im 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 wasnt anything wrong with them,...