“A Grade 4 lesson that included material critical of Alberta’s oil industry prompted a Facebook debate among parents that devolved into threats and prompted the school to call in the RCMP and cancel a holiday dance.” https://www.theglobeandmail.com/canada/alberta/article-rcmp-intervene-after-school-lesson-on-albertas-oil-industry-prompts/
This debate shows very conflicting views on the oil sands that have very little in common. As far as theories are concerned, there are a number of way to investigate this RLE. A TOK essay could look at a theory / theories on education about what the role of a teacher is when it comes to environmental issues. It could also look a theory / theories on the oil sands itself, or on media coverage of the incident.