text: Given our goal of exploring the diﬀerence between the two discourses, the 615,816 tweets 
  containing both hashtags simultaneously were excluded to diﬀerentiate between the two datasets 
  following [67,80]. A total of 6,662,478 tweets were retained, of which 5,774,747 contained #climatechange, 
  and 887,731 contained “#globalwarming”. The number of qualiﬁed tweets containing #climatechange 
  and #globalwarming in each year is displayed in Figure 1a. 