Science communication is a key skill for undergraduates, but little research explores how biology students communicate about societally important, yet controversial topics like climate change. In this study, we explored whether and how biology students took on the role of science communicators about climate change. We surveyed 191 biology students at 38 universities about their climate change communication frequency and preparedness. We interviewed 25 of the survey participants about their experiences communicating about climate change and their needs when learning about climate change communication. We found that students were communicating about climate change and felt confident discussing the causes and effects of climate change, but they were less confident discussing the solutions to climate change. Students tended to "preach to the choir" by mostly communicating with those who already accepted climate change and avoiding interacting with others who disagreed with them about climate change. Students described a lack of science communication training but had a desire to be taught effective communication skills. Our interviews indicate that if these students felt more prepared to communicate, it may make them more willing to discuss climate change and particularly with people who have different views from them.