The first Earth Day was celebrated on April 22, 1970 — 48 years ago — and, goodness, how the world has changed since then. We’ve come a long way since the days of burning trash and pumping our gas guzzlers with leaded gasoline. In honor of those 48 years, here are 48 important changes and milestones since the first Earth Day.

 

Read more at www.earth911.com