Transcripts for KPIX CBS Weekend News 20161113 01:57:00 : vi

>> ninan: we close tonight in the sierra nevada, home to some of the tallest trees on earth. but the mighty sequoias are disappearing. chris martinez shows us how scientists and volunteers are creating a new generation. >> reporter: this giant sequoia has survived more than 3,000 years. it's one of the largest trees on the planet, but it's now in jeopardy. scientists say man has cut down more than 90% of the world's ancient tree. pollution and climate change threaten what's left. >> i'm going up. >> reporter: arborist michelle miller is on a global mission to save them. >> there's got to be something special about this tree, how it's live so long and gotten so big. i'll see you at the top. >> reporter: we climbed with jacob's team to the top of a

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