Kempton et.al (1995) notified that most people do not know enough about environmental issues to act in an environmentally responsible way. Environmental knowledge can be defined as “a general knowledge of facts, concepts, and relationships concerning the natural environment and its major ecosystems (Fryxell & Lo, 2003, p. 45). In other words, environmental knowledge involves what people know about the environment, key relationships leading to environmental aspects or impacts, an appreciation of “whole systems”, and collective responsibilities necessary for sustainable development. Rokicka (2002) found that attaining a high level of environmental knowledge produces much better pro-environmental behavior. Concordantly, Mostafa (2009) found that environmental knowledge has a significant impact on the consumers’ intention to buy green products