Three-time Academy Award-nominated movie star Leonardo DiCaprio and his filmmaking partners, Nadia Conners and Leila Conners Petersen, have done us a great favor. They have assembled an incredible array of passion and brainpower in their stirring documentary, The 11th Hour, to teach us just about every thing we need to know about the fate of planet Earth -- how bad things are, and what we can do to reverse the effects of humanity's rapid devastation of this planet.

The filmmakers have culled 90 minutes of brilliance from approximately 150 hours of interviews of the best of the best -- the rock stars of ecology, public policy, social critique and visionary philosophy. They have done a magnificent job. The 11th Hour is a first-class overview of the technology, the politics, the consequences of corporate and consumer behavior, and the aspirations and means to fix the mess we humans have created. As DiCaprio says, "We wanted to present the experts and have them carry the narrative of the film ..." which they do extraordinarily well. The film is great-looking as well, as the interviews are interspersed with scenes of contrasting beauty and environmental victimization -- dizzying montages, barren forests, beautiful seas, mudslides and clubbed baby seals, all set against a vast array of consumer images.

Are we at the 11th hour?

The "11th hour," of course, refers to the last moment when change is possible before it's too late to do anything. And the obvious message of DiCaprio's film is that we residents of planet Earth have reached a tipping point in terms of how we live and the impact we impose on our ecosystems. And for this reason, The 11th Hour is at times not easy to watch or come to terms with. It is a challenging, sometimes overwhelming experience that explores both millions of years of the Earth's existence in all its complexity, and the immediate present and the enormous impact human behavior is having not just on the planet's climate systems, but on our oceans, our air quality, our forests and the communities we live in.