Citizens increasingly use online platforms, and in particular YouTube, to get informed. This paper addresses the role of YouTube’s recommendation system in science communication to assess whether YouTube's recommendation system is creating filter bubbles on the climate change issue. It, therefore, contributes to the growing literature that finds that such filter bubbles actually do not exist. The paper shows that users are likely to get content with similar opinions, at least for a few recommended videos in a row. In addition, it was observed that the same promoters of climate denial appear over and over again in different recommendations. Given all that, YouTube can lead to the creation of filter bubbles where users do not have access to all relevant scientific information.