Attribution
There were no attributional articles in the 1986-1996 period and very few (0.7%) in the 1997-2003 period (Fig. 2b). There was a large spike in attributional articles in the 2004-2019 period (43.7%). Negational articles (54.5%) had the highest proportion of attribution, followed by neutral (23.3%), and affirmational (1.1%) articles.