California’s giant sequoias are being destroyed by our wildfires. Scientists are resorting to extraordinary methods to save them

SPRINGVILLE, Tulare County — Dust kicked up from a fire-scarred forest floor as a dozen men shouldered bags of bright green seedlings they hoped would give rise to the largest trees in the world — an ascent the workers will not live to see.The crew, trudging on a recent morning through the Mountain Home State…