In this study we assess how higher education students (pre-service teachers) value and understand the impact of livestock production on global warming. We used a questionnaire with 91 students from a Portuguese institution and 111 from a Spanish one. The students had to mention measures to fight global warming, to explain the relationship between livestock production and global warming and to rank the impact of this cause compared to others. The Portuguese students showed a better understanding of this issue. Even so, the majority of the students do not recognize the high impact of livestock on global warming and consider other causes more relevant.