17 pages, via online journal, Sarcastic content is prevalent in online social media, although little research has explored its effects. In this study, we examine how exposure to one-sided versus two-sided sarcastic perspectives on climate change shapes beliefs about climate change. We find that exposure to one-sided messages that use irony to deride those who believe that climate change is a hoax (presented in The Onion) raises belief certainty in and perceived risk of climate change for those who do not already believe climate change is an important issue (N = 141). The two-sided message (presented by The Weather Channel) does not show any effects.