Wednesday in San Francisco, during his speech to the American Geophysical Union, Gov. Jerry Brown (D-CA) while vowing to the crowd of climate scientists that he will “fight” President-elect Donald Trump’s administration on climate change policy, Brown took a swipe at Breitbart News Network.

Brown said “The measures on methane that I signed into law, Breitbart and the other clowns talked about cow farts. That’s what they reduce. Everything is reduced from a serious to just it’s a joke. Well it’s not a joke.”

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