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August 3, 2015

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First-graders at Henderson's Cairo Elementary, as part of a service learning project and Earth Day celebration, place handfuls of dirt around a oak tree they planted at the school Tuesday, April 22, 2014, in Henderson, Ky.

The Gleaner, Mike Lawrence / AP

First-graders at Henderson's Cairo Elementary, as part of a service learning project and Earth Day celebration, place handfuls of dirt around a oak tree they planted at the school Tuesday, April 22, 2014, in Henderson, Ky.