The 150th anniversary of Lincoln's act to preserve Yosemite valley during the Civil War serves as a reminder of how the shared experience of landscape can help unite a people.
Frederick Law Olmsted – a man of strange and restless talent – dreamed of making a better, greener world accessible to all.
Long-established Shelburne Farms program in Vermont sends out ripples worldwide.
An increasing number of cities are temporarily closing streets to cars and opening them to pedestrians and cyclists. It fosters a greater sense of community.
To keep natural history alive, a New York program tries grafting ancient giants.