Scientists are trying to find leaky gas wells and pipelines. They want to know how much of this infrastructure is leaking methane - a potent greenhouse gas. Naomi Zimmerman is checking a computer screen inside a white van that looks like it came straight from an episode of Storm Chasers. “There’s a blue line with the green line, but you can’t even see it anymore because the fit is spot on. We’re ready to do our calibrations,” she says.