Scientific American: In a 2016 study published in EcologyUSGS ecologist Adrian Das, Stephenson and their colleague Kristin Davis of Colorado State University’s Natural Resource Ecology Laboratory tracked the lives of more than 23,000 trees in plots throughout Sequoia National Park over a 13-year period. On average about 2 percent of the trees died each year, with insects or pathogens destroying more than half of them.

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