This commentary considers the separate but interconnected evolution of science communication and environmental communication as fields of research and practice, and argues for better mutual understanding between the fields, including an understanding of necessary differences. It notes that the repertoires of science communication and environmental communication overlap but have different emphases. Environmental communication emphasises public allegiances with a view to persuasion; science communication has focussed on public understanding and appreciation of science. The potential and the need for closer cooperation are growing as the authority of science is challenged in political arenas. Both fields recognise the important contributions of science to public sense-making and informed decision-making on major issues. Increasing engagement with the science that underpins environmental issues could benefit environmental communicators. In political contexts, science communication could learn from environmental communication’s greater attention to advocacy and symbolic representations.