Humans have impact on the environment - whether it's in the form of a littered cigarette butt or how a human can French-braid a pasture of high grasses into a beautiful winding pattern. That's the message in Pamela Callender's exhibit 'Environmental ReFlux,' which opened with a reception July 18 and will run 9 a.m. to 5 p.m. weekdays through August at the Conservation Foundation of the Gulf Coast, 400 Palmetto Ave., Osprey.