That was a report about the cow methane problem in California.
https://sanfrancisco.cbslocal.com/2016/09/19/cow-fart-regulation-passed-into-california-law/
https://www.sanluisobispo.com/opinion/editorials/article187975784.html
https://www.latimes.com/local/lanow/la-me-cow-gas-20161129-story.html