Five years ago, a tragic and depressing environmental story unfolded when thousands of giant sequoia trees, an iconic California species that tower 300 feet high and can live for 3,000 years, were killed during multiple large wildfires that roared across the southern Sierra Nevada. The fires in 2020 and 2021 at Sequoia National Park, Sequoia National Forest and other areas burned with unprecedented intensity, killing nearly 20% of the world’s giant sequoias, and exposing the growing vulnerability of the most massive trees on the earth. …After the fires, stunned scientists, park managers and environmental groups formed a partnership to reduce the chances of similar catastrophic outcomes in the years ahead. Now, with another summer fire season looming, they say they are making encouraging progress. Since their efforts began in 2022, the partnership has thinned the overgrown brush and small trees that provide fuel for fires to burn hotter in 44 of the 94 giant sequoia groves in California.