Associated Press: Robert Redford, movie icon, Oscar-winning director and founder of the Sundance Film Festival, knows the power of a good story. So when he heard about the battle being waged in Texas by an unlikely assortment of activists to halt construction of 18 coal-burning power plants, Redford knew there was a powerful story waiting to be told. Not just a manifesto of environmental awareness, not just a screed against pollution and global warming, but a tale of taciturn Texas ranchers, …