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Laumeier Sculpture Park (2022)

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Tree Wonder (2022)

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Partner With Trees (2022)

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Friends of Ardee Bog (2018 - ongoing)

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Mushroom Music (2019)

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New York City Tree Alphabet (2018-2019)

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Tree School, Dublin, Ireland (2017)

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Climate Strike, City streets (2017 - 2020)

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Walk With Me, Offenbach, Germany (2016)

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Walks, NYC (2014)

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Laboratorio della Vigna: Ten Years Later, Venice (2013)

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Factory Garden, Derry, Northern Ireland (2013)

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Light and Landscape (Storm King Art Center, 2012)

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On The Nature of Things, Dublin, (2011)

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Nature, Brooklyn, New York (2011)

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Tree Museum, Grand Concourse, Bronx, NY (2009)

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Landscapes of Quarantine, North Brother Island, New York (2009-2010)

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Gran Bazaar, Mexico City (2006)

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Lament (2006)

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Weed Walks: Venice Biennale (2003)

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Under Åpen Himmel, Hamar, Norway (2002)

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Weeding, city streets (1999 - ongoing)

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Bog Grappa (1999)

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Bog Awareness (1997-1999)