A group of activists known as Redwood Forest Defense has been occupying treetops in northern California as a form of non-violent protest to block the logging of redwood forests. Their struggle pits them against the Green Resource Diamond Company, which has been logging in the region since 2020. Portland-based filmmakers Lawrence Lerew and Derek Knowles directed the short film, “Sentinels,” which is now streaming on the L.A. Times website. They join us to talk about the making of their new film.