Activists at a forest camp organized to protest US e-carmaker Tesla’s expansion plans in suburban Berlin want to take legal action to prevent state authorities from forcing them to dismantle tree houses they built for the action. Protesters said said they will “exhaust all legal means to prevent an eviction,” according to a statement from the “Stop Tesla” initiative. The group has not said what specific steps it intends to take. On Friday, authorities confirmed an extension of the camp under certain conditions, including that they must dismantle their tree houses by Monday. The activists had a…