text: **Figure 6.**Rank order correlation between hashtags in the climate change and global warming discourses 
  from 2009 to 2018 (**a**); correlation between matrices of the climate change discourse and the global 
  warming discourse from 2009 to 2018 (**b**). 
  
  **5. Discussion**
  
  5.1. Themes and Structure of the Two Discourses 
  
  5.1.1. Phenomenon vs. Mechanism of Action 
  
  Climate change and global warming have long been two competing frameworks shaping the 
  public’s perceptions, memory, and interpretations of climate issue by highlighting diﬀerent aspects of 