It comes from cows, trash and even termites. Methane is the "other greenhouse gas." Human activity produces far less methane than carbon dioxide, but methane is a much more potent warming gas. Why is methane starting to get a second look from both scientists and policy makers? Reporter: Craig Miller
Where does methane come from, and how does it get into California's atmosphere? Watch an audio slideshow and listen to the complete radio series. Explore more
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Audio Slideshow
