The internet abounds with free science education applications. But, on their own, these applications have limited capacity to teach students curricular concepts or skills. The author integrated several free web-based applications into a broader pedagogical approach called T-GEM, in which the teacher guides student investigations. In this article, she demonstrates how she used several of these web-based applications in conjunction with T-GEM to teach students in grades 8 and 10 about a "hot" topic in science: global warming. (Contains 3 figures and 5 online resources.)