Three eco-terrorists were sentenced Friday to federal prison for a series of firebombings that put towns in the Sierra foothills on edge. Ryan Daniel Lewis, 22, the alleged leader of the group, was sentenced to six years, and two sisters - Eva Rose Holland, 26, and Lili Marie Holland, 21 - were each handed two-year prison terms. Prosecutors alleged Lewis recruited the Holland sisters and Jeremiah Dean Colcleasure, 24, on Christmas Eve 2004 to help him burn down two unoccupied upscale homes in Lincoln, a Sacramento suburb, in the name of the Earth Liberation Front. The FBI calls the ELF...