Polarization observed in a particular social media site need not necessarily be a result of events and discussions that happen on that platform. Observed trends of polarization in online social media may therefore emerge from activities of users in other online platforms or offline activities. As an instance from a 2019 study, messages propagating anti-climate change beliefs on Twitter were collectively found to carry no credibility. Hence it is highly unlikely that such messages which are not credible can increase polarization of climate change opinions on Twitter.