Was it the Mulberry River, or the Buffalo? Four odd decades later, the details have gotten murky, but one day, while floating an Arkansas waterway, Debbie Doss and Cowper (pronounced “Cooper”) Chadbourn began to pick up trash. And while the couple didn’t plan it, that mostly forgotten moment delineates a clear before-and-after in their lives. Expressed in river terms, the day in question-when they realized a recreational float could also include clearing litter-gave rise to the headwaters of their conservation work.