A wildfire threatening the largest grove of giant sequoias in Yosemite National Park more than doubles in size in a day, and firefighters are working in difficult terrain to protect the iconic trees.
A wildfire threatening the largest grove of giant sequoias in Yosemite National Park more than doubled in size in a day.Heavy smoke obscured views at Yosemite and created unhealthy air qualityFirefighters are working in difficult terrain to protect the iconic trees and a small mountain town as the US weathers another very active year for fires.
A sprinkler system set up within the grove kept the tree trunks moist and officials were hopeful that the steady spray of water along with previous prescribed burns would be enough to keep flames at bay, Ms Phillipe said. The giant sequoias, native in only about 70 groves spread along the western slope of California's Sierra Nevada range, were once considered impervious to flames but have become increasingly vulnerable.
Lightning-sparked wildfires over the past two years have killed up to a fifth of the estimated 75,000 large sequoias, which are the biggest trees by volume and a major draw for tourists to the national park.
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