This rehashing of the early environmental movement from the '50s through the first Earth Day in 1970 and the following decade isn't only uninformative, it's also dangerously scatterbrained. In traversing the holiday's history, director Robert Stone swings along like a child on monkey bars, as though the only way to advance the narrative is to hit every single rung--yet he never stops long enough to fully grasp any of them. You will learn things you already know (hybrid cars should have come out sooner!) and you'll be offered paper-thin explanations as to why (car companies were stuck in their ways!). Even the treatment of the first Earth Day is full of holes as to why it was a success. by Jane Carlen