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California's historic drought has killed more than 6 million trees in the Sierra Nevada, from cedars to oaks. Now the state's iconic giant sequoias are starting to show signs of stress. KQED Science producer Gabriela Quirós follows a team of UC Berkeley biologists as they climb several giant trees in Sequoia National Park to measure their health.

KQED NEWSROOM is a weekly news magazine program that airs on television, radio and online. Watch Fridays at 8 p.m. on KQED Public Television 9, listen on Sundays at 6 p.m. on KQED Public Radio 88.5 FM, or watch online here.