PBS News Hour: Ambitious Louisville study seeks to understand impact of trees on our health

Trees can add beauty and serenity to a neighborhood -- but can they also improve the health of its residents? In Kentucky, the University of Louisville — with help from the National Institutes of Health and The Nature Conservancy — aims to find out. Called Green Heart Louisville, the initiative involves a large-scale scientific study of how greenspaces affect public health. John Yang reports.

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