"For anyone in the green movement under 30 in the US, Earth Day has always just...been. It's existed as a day when you head to the park or zoo with your parents for activities that have to do with recycling, gardening, and saving endangered animals. Or if you're in high school or college, it's the day you go plant trees or participate in a river clean-up and get some extra community service credits. But, how did it start? Really, it's an example of grassroots environmentalism at its best".