It's been one-half century since the first official "Earth Day" was held on April 22nd 1970. Over the past five decades, there have been some great improvements in our collective efforts to clean-up the mess we've made of and on the planet, but also some serious setbacks as well. Bill Kurtis, respected journalist, documentary filmmaker and award winning producer, shares his insights and perspectives on the "State of the Planet" and if he feels that there is still a reason for hope, when it comes to life on earth. "Amazon" by our friend, the late, great John Denver.