Black hikers breaking the 'green ceiling' and clearing a path for enthusiasts

African Americans make up just 7% of people venturing to national parks while white visitors make up 78% - but Outdoor Afro is training leaders to change that

David McCullough often gets sideways glances while he is hiking near Philadelphia. There is nothing immediately startling about McCullough, a museum educator with a studious look and a neatly trimmed goatee. But as a black man in the great outdoors, McCullough is usually in a racial minority of one.

"It's conspicuous, you're aware of it," he says. "There are looks. You do get looks of concern, you can see that people are curious about why you are there."