Differences were observed in Port-Harcourt city residents’ knowledge and practices of solid waste management. This is inconsistent with previous research (Van Liere & Dunlap 1981; Kellert 1985; Eagles & Muffitt, 1990; Palmer, 1995 and Raudsepp, 2001). According to Van Liere and Dunlap (1981) study, gender is not a significant predictor of environmental concerns and attitudes as other socio-demographic variables.