“El Doctor,” is a former accountant turned full-time surfer and coach of Puerto Rico’s surf team. He’s also a tenacious defender of his marine environment. FRONTLINE: World reporter Sachi Cunningham, herself a surfer, ventures to the Caribbean island to tell the tale of El Doctor and his surfer activists who challenge the army’s assault on their beach with sit-ins, the ingenious deployment of an inflatable doll and, ultimately, a successful lawsuit against the US Army Corps of Engineers. El Doctor even dons the costume of a comic super-hero, in the style of Mexico’s masked, caped crusader, Superbarrio, defender of the downtrodden.

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Another alarm about Global Warming came with February’s report that glaciers in Greenland are melting faster than ever. Skeptics already are raising questions, adding that air and water pollution are much more immediate threats than rising sea levels. Some scientists claim that Earth is reaching a “tipping point,” beyond which no conceivable effort will make a difference. Others say human beings will adapt to whatever happens. In the meantime, why not launch a satellite that could clear up some of the scientific uncertainties? We hear the latest dispute about the impact of climate change.

Listen to Climate Change from ‘To the Point’ (Real Player Required)

Elvis Mitchell hosts writer-director Tim Burton (Beetle Juice, Batman, Big Fish), discussing his two films from last year, Charlie and the Chocolate Factory and the Academy Award-nominated animated feature Corpse Bride.

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Scholars, journalists and podcasting practitioners discuss how technology intersects with business, law, journalism and Internet culture. From the Duke University Podcasting Symposium, watch “Business & Monetization Panel Discussion about podcasting”.

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Sundance Film Festival Puts More Content, Emphasis Online: For the first time at the festival more than half of the short films, known as “Shorts,” will run online. In fact, about 50 of 73 are available for viewing. It’s been rare for filmmakers to let the public view their original content on the Web.

Watch 50 exclusive selections from the collection of Short Films from the 2006 Sundance Film Festival in Flash 8 video