LOS ANGELES: When Stonehaven Production's environmental-action documentary The Great Warming opened last week, it came armed with a multi-tiered PR platform.

Crafted by the film's producers, with help from PR firms including LA-based New Venture PR, grassroots outreach efforts were designed to "show people there are things they can do right now" to make homes and lifestyles more green-friendly, said agency principal Hal Bringman.

Though the film, playing in select Regal Cinemas theaters and soon available on DVD, features voiceovers by Keanu ...