This article reports on lessons about climate change which pose many challenges for science teachers. The natural world today offers a broad--and dire--catalog of scientific phenomena for teachers wanting to craft classroom lessons on the topic of climate change. As public concern about global warming increases, teachers are carving out a larger place for those issues in science classes, particularly at the high school level. Yet educators also say they face challenges in finding accurate and student-friendly classroom activities and lessons on the topic, partly because textbooks and other materials have not caught up to a growing body of scientific evidence about climate change. Consequently, many science teachers are turning to Web sites and resources produced by scientific organizations. They are also sharing strategies at conferences and workshops and by word of mouth. Teachers also face questions about how to present the science of climate change without being accused by students, parents, or administrators of harboring a political agenda. [This article was produced by Editorial Projects in Education, Bethesda, MD.]