When Cleveland's Cuyahoga River actually caught fire in 1969, it became a national rallying cry for the country to confront its long-neglected water pollution problems.
Though few relics of the legendary Pennsylvania Mainline canal system exist today, it set in motion an era of canal building that still shapes how we move goods around the country.
A new PBS film premiering next week takes a fresh look at the life and work of the Pennsylvanian regarded to be the godmother of the modern environmental movement.
