Students participated in online discussions about sustainable development using a lesson from the Center for Global Geography Education. Students showed statistically significant changes in attitudes about solutions for global problems. Results suggest Chilean students' attitudes toward grades in geography classes, and attitudes toward awareness of world events became more negative; however, attitudes toward email communication increased as did US students' attitudes toward communicating with people in other countries. Students in USA showed more positive attitudes toward understanding global issues like sustainable development, whereas they stated a decrease in attitudes toward learning how peers in other countries think about world problems. (Contains 1 table.)