"Global warming is now thought to be a leading cause…

The global warming documentary film An Inconvenient Truth (2006) was successful, and other similar documentaries followed.

“Global warming is now thought to be a leading cause of documentaries” was posted on Twitter by Dave on February 23, 2012. “Global warming is now thought to be the leading cause of documentaries” was posted on Twitter by sickipediabot on February 24, 2012. The joke probably originated on the Sickipedia website.

Wikipedia: An Inconvenient Truth
An Inconvenient Truth is a 2006 American concert/documentary film directed by Davis Guggenheim about former United States Vice President Al Gore’s campaign to educate people about global warming. The film features a slide show that, by Gore’s own estimate, he has presented over 1,000 times to audiences worldwide.

Twitter
Dave
@daveywww
Global warming is now thought to be a leading cause of documentaries.
7:01 AM · Feb 23, 2012·Twitter for iPhone

Twitter
Andrew Mexo O’Connor
@acmexo
Global warming is now thought to be a leading cause of documentaries.
7:02 AM · Feb 23, 2012·Twitter Web Client

Twitter
sickipediabot
@sickipediabot
Global warming is now thought to be the leading cause of documentaries.
3:28 AM · Feb 24, 2012·sickipediabot

Twitter
Michael Nolan
@mikeyno
“Experts say global warming is the leading cause of documentaries.” - best line in neighborhood comedy show tonight.
12:43 AM · May 21, 2015·Facebook

Twitter
Swedish Canary
@SwedishCanary
Research shows that Global warming is now thought to be the leading cause of documentaries.
6:55 AM · Jan 30, 2016·Twitter for iPhone

Twitter
Bob Kostic
@causticbob
Global warming is now thought to be the leading cause of documentaries.
6:37 PM · Jan 4, 2021·Twitter Web App