This is an extended version of the KGNU Science Show, How on Earth. It features Greg Frost, a scientist with the University of Colorado at Boulder and with NOAA, the National Oceanic and Atmospheric Administration. He’s on the team led by Gabrielle Petron which has been studying leaks from natural gas production. In this extended interview, Greg tells us about natural gas wells in Colorado that are leaking twice as much methane and benzene into the atmosphere as official estimates have indicated. Methane is a potent greenhouse gas. Benzene is a carcinogen. Let’s listen in now, as Greg Frost tells How on Earth’s Shelley Schlender what their study of leaking methane from gas wells found.