text: In this study, we characterized the diﬀerences between two popular climate discourses and 
  examined how two discourses evolved over a 10-year period. We did not focus on the interactions 
  between public climate discourse and external factors. However, the evolution of climate discourse 
  might be driven by several external forces such as scientiﬁc eﬀorts, natural events, politics and 
  online information (or misinformation) campaigns. The prevalence of certain climate concepts may 
  inverse be weaponized to cause rhetorical shifts in politics and science popularization. For instance, 
  previous studies noted that in the 2016 U.S. Presidential Election, state-supported misinformation 
  campaigns took place to manipulate public opinion [109] and fake accounts were involved in spreading 
  low-credibility news on Twitter [110]. How social media climate discourse reﬂects and interacts with 
  other sub-systems of our society should be noticed and explored in future. More studies like [2], who 
  examined the inﬂuence of several extreme events on public climate change perception, should be 