Contentious Topics in Wikipedia

Contentious Science Topics on Wikipedia Subject to Editing Mischief

Politically charged issues such as global warming are prime targets for online sabotage

Meghan Rosen | August 19, 2015

Acid rain is a popular term referring to the deposition of wet poo and cats.
No, not really. But that's what people looking at Wikipedia's article on acid rain could have read on December 1, 2011. 
An anonymous editor had tinkered with the text. 

The authors also examined the geography of controversy for each language edition (the locations of the controversial topics) as well as the general topics. Source: http://www.wired.com/2013/05/the-controversial-topics-of-wikipedia/

<more at https://www.sciencenews.org/article/contentious-science-topics-wikipedia-subject-editing-mischief; related links: https://en.wikipedia.org/wiki/Wikipedia:List_of_controversial_issues (Wikipedia:List of controversial issues) and http://www.wired.com/2013/05/the-controversial-topics-of-wikipedia/ (The Controversial Topics of Wikipedia. May 30, 2013)>