In this study, researchers from the University of Santiago de Compostela (Spain),n assess the sentiments and emotions related to climate change in the UK and Spain during the first six months of 2019, and how these relate to different preferences and concerns about energy policies. In doing so, Twitter messages related to climate change occurring in both countries were analysed using natural language processing (NLP) tools. In total, 811,211 tweets from 806,068 different users from the UK, and 961,969 tweets written by 956,624 users from Spain were analysed. The study concludes that tweets related to climate change posted by UK users are less negative than in Spain. However, the results overall show quite similar views about preferences for energy policies in these two Western European countries. In particular, renewable sources of energy are associated with positive perceptions, and coal with negative; whereas heteregoneous preferences are present in the case of nuclear energy.