The rapid expansion of artificial intelligence (AI) tools for research and writing has left librarians with a new challenge: how to teach ethical use of AI in a time of little to no regulation, pending court cases regarding copyright, and concerns over the level of environmental impact and potential stunting of critical-thinking skills. Students’ views of and experiences with AI are mixed,1 though their use of such tools is growing. Introducing a simple method for considering the issues that are inherent in AI use can help guide students (and faculty) through critical thinking that can deepen their understanding of AI and promote use that minimizes environmental, social, and intellectual harm. PEACEful Use of AI, or PEACE, offers a set of guiding questions, informed by values and ethics embedded within information literacy knowledge practices and dispositions, that encourages critical thinking before selecting or using an AI tool