Forbes: Around my house the phrase methane explosions tends to open up the door for the sorts of jokes teenage boys like to make, but as utilities deal with aging pipelines and the natural gas market continues to grow, the threat of methane leaks is no laughing matter. Northern California utility Pacific Gas & Electric (PG&E) found this out the hard way in 2010 when a faulty weld in its San Bruno pipeline gave way, leading to a massive explosion that destroyed multiple homes and killed eight people. Since...