CNBC: It's Earth Day 2013, and it's a good time to step back and see how we've been doing since the first one 1970. That's when 20 million people took to the streets to protest rivers on fire, DDT-poisoned birds, sewage on beaches and a devastating oil spill off the pristine Santa Barbara, Calif., coast. Soon after, many of our basic national environmental laws were passed in direct response to this massive grassroots movement.
Is there another wave of this activism coming?
Since those early days,...