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Karen D. Holl

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Professor of Restoration Ecology, University of California, Santa Cruz

Planting 8 billion trees a year would replace about half of the 15 billion cut down annually. Michael Tewelde/AFP via Getty Images

August 23, 2021

How would planting 8 billion trees every year for 20 years affect Earth’s climate?

Karen D. Holl, University of California, Santa Cruz

Planting a massive number of trees can help slow climate change, but it is only part of the solution.

Aerial view of native seedlings for forest restoration at the the Instituto Terra, Aimores, Brazil. Christian Ender/Getty Images

April 24, 2023

Arbor Day: Why planting trees isn’t enough

Karen D. Holl, University of California, Santa Cruz and Pedro Brancalion, Universidade de São Paulo (USP)

Large-scale tree-planting projects are politically popular and media-friendly, but without effective planning and long-term management, they can do more harm than good.

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Location: Santa Cruz, California, U.S.
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Joined March 16, 2017