text: The status of the two discourses varied signiﬁcantly in the more recent years in the study period. 
  Data from Google in prior study suggested that the search record for global warming was larger 
  than that of climate change in earlier times [13]. The authors found that in the battle to be the most 
  representative hashtag for global climate concern, #climatechange showed growing popularity and 
  became an overwhelming trending topic compared with #globalwarming. Also, #climatechange 
  showed a stronger ability to incorporate diverse hashtags into its discourse in both relative and absolute 
  dimensions. Comparatively, the popularity of the global warming discourse among social media 
  users did not increase apparently in terms of tweets volume and hashtag diversity, especially when 
  considering the yearly increase in Twitter users. The reason for the observed shift in public discourse 
  toward climate change from global warming may be attributed to the high exposure of climate change 
  in the media and scientiﬁc reports in recent years [13]. Previous studies noted that perceived scientiﬁc 
  consensus can increase acceptance of science [101]. Though global warming has been commonly used 
  since the 1980s to describe the world-wide temperature rise, climate change is preferred by scientists to 
  refer a range of complex changes of climate [102]. Pew found science-related accounts draw millions 
  of followers on Facebook and volume of posts they released climbed in past years [103]. Climate 
  scientists are found to be opinion makers on Twitter [104]. As social media has become an emerging 
  platform for science popularization, scientiﬁc community might contribute to the prevalence of climate 
  change discourse by talking about climate change facts and mitigating measures [75]. 