SAN FRANCISCO — As some major U.S. cities funnel record-high investment in their parks, the future of green space remains uncertain in many other cities nationwide.

While parks are crucial to the social, physical and mental health of their communities, about one in three people in the U.S. — over 100 million people, including 28 million children — don’t have access to a park within a 10-minute walk of their home.

A groundbreaking report and survey newly released by the Trust for Public Land, however, finds that parks are “The Great Unifiers” for Americans across demographic and partisan lines.

This year’s ParkScore index, published by Trust for Public Land annually since 2012, ranks park systems across the country’s 100 most popular cities based on five factors from the perspective of p

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