We've heard about it for months now. The Sundance Channel is launching a new block of programming called "The Green" on April 17. Each Tuesday night at 9pm you'll be able to tune in to a block of green programming. Today, we recommend that you take a sneak peak at the first episode of Big Ideas for a Small Planet. It's available free on iTunes through April 17.

The episode for this documentary series about "forward-thinking" designers focuses on Fuel. The question that is posed at the beginning of this episode is: "Can we imagine a world without gasoline?". Then, they go to visit Joel Woolf of Veg Powered Systems. Idea 1: Vegetable Oil.

Idea 2: Biodiesel. They found a character for this one. Big Ideas went to talk to Colette Brooks of BioBling.com, which hooks up people with biodiesel capable cars, and the fuel.

Idea 3: Ethanol. For this one, they visit with Jeff Simmons, a race car driver for Team Ethanol. Towards the end of the episode, ethanol races against biodiesel. Who do you think wins?

Big Ideas got big names to make appearances on this show. You'll see clips of interviews with Dr. David Suzuki, Chelsea Sexton, and Laurie David scattered throughout the episode.

So check it out. It's a 25 minute free episode, downloadable on iTunes. Then tune in to Sundance's the Green each Tuesday at 9pm for more Big Ideas.