This activity uses the jigsaw method to encourage students, in groups, to become experts on different types of evidence as a means of understanding climate change. Each group focuses on a topic, highlights at least one data set within that topic, and researches the data collection process along with the potential consequences of the evidence. Students are asked to critique the evidence they investigate, using a prepared checklist, and to share the results of their research with their classmates. Finally, students evaluate the evidence behind a skeptic’s claim, and discuss the knowns and unknowns about climate change.