In May, arborist Jim Clark inched up a giant sequoia in the southern Sierra Nevada mountain range to collect new growth from the tree’s canopy. Clark volunteers with Archangel Ancient Tree Archive, a nonprofit.
In May, arborist Jim Clark inched up a giant sequoia in the southern Sierra Nevada mountain range to collect new growth from the tree’s canopy. Clark volunteers with Archangel Ancient Tree Archive, a nonprofit. Scott Smith AP
In May, arborist Jim Clark inched up a giant sequoia in the southern Sierra Nevada mountain range to collect new growth from the tree’s canopy. Clark volunteers with Archangel Ancient Tree Archive, a nonprofit. Scott Smith AP

Group clones California giant trees to combat climate change

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