This study tests a model of reinforcing spirals in the context of global warming, using a 2-wave, within-subjects panel survey with a representative sample of Americans. Results show that, within waves, conservative media use is negatively related to global warming belief certainty and support for mitigation policies, while nonconservative media use is positively associated with belief certainty and policy support. In addition, the results show that consuming conservative or nonconservative media at Wave 1 makes people more likely to consume those same media at Wave 2, partly as an indirect result of the media’s effects on global warming belief certainty and policy preferences. Wave 2 media use, in turn, further strengthens audiences’ global warming belief certainty and policy preferences. Download the Article Here.