Environmentalists who have fought loggers for generations have a surprising new strategy to save California’s storied old-growth redwood forests: Logging. Save the Redwoods League, a venerable San Francisco organization that has preserved more than 214,000 acres of redwood forest since it was founded in 1918, is embarking on a $5 million plan to thin out 10,000 acres of redwoods, Douglas fir, tan oaks and other trees. The logging will begin at Redwood National Park and Del Norte Coast Redwoods State Park near the Oregon border over the next five years. After that, the group plans to thin forests in nearby...