The purpose of this study is to analyze the sixth curriculum textbooks of high school science courses in relation to the greenhouse effect concept and find the incorrect descriptions of that concept and then suggest some improved schemes. Some incorrect descriptions, pictures and tables on the greenhouse effect concept were found in texts. They might contribute to forming and/or reinforcing misconceptions about that concept: the important greenhouse gases, the changes caused by the greenhouse effect, global warming, energy sources, greenhouse experiments and physical processes. Therefore some improved schemes were suggested