California has big environmental problems to address — extreme drought, wildfires, species extinction — but the fate of a few herds of tule elk also invokes raw emotions more than four decades after they were reintroduced to Point Reyes National Seashore, about 100 miles from Sacramento. Now, climate change and extreme drought have added urgency to the dispute between environmentalists, the National Park Service, ranchers and indigenous tribal interests in this stunning part of the Northern California coast.